21122112020 has 12 divisors (see below), whose sum is σ = 44356435284. Its totient is φ = 8448844800.

The previous prime is 21122112017. The next prime is 21122112023. The reversal of 21122112020 is 2021122112.

It is an interprime number because it is at equal distance from previous prime (21122112017) and next prime (21122112023).

It can be written as a sum of positive squares in 2 ways, for example, as 2381049616 + 18741062404 = 48796^2 + 136898^2 .

It is a super-2 number, since 2×21122112020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122111986 and 21122112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122112023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528052781 + ... + 528052820.

It is an arithmetic number, because the mean of its divisors is an integer number (3696369607).

Almost surely, 2^21122112020 is an apocalyptic number.

21122112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122112020 is an abundant number, since it is smaller than the sum of its proper divisors (23234323264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122112020 is a wasteful number, since it uses less digits than its factorization.

21122112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056105610 (or 1056105608 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21122112020 its reverse (2021122112), we get a palindrome (23143234132).

The spelling of 21122112020 in words is "twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, twenty".