21112020120020 has 24 divisors (see below), whose sum is σ = 44335373224968. Its totient is φ = 8444783100800.

The previous prime is 21112020120017. The next prime is 21112020120031. The reversal of 21112020120020 is 2002102021112.

It can be written as a sum of positive squares in 4 ways, for example, as 145456806544 + 20966563313476 = 381388^2 + 4578926^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21112020119977 and 21112020120004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6361610 + ... + 9093630.

It is an arithmetic number, because the mean of its divisors is an integer number (1847307217707).

Almost surely, 2^{21112020120020} is an apocalyptic number.

21112020120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112020120020 is an abundant number, since it is smaller than the sum of its proper divisors (23223353104948).

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

21112020120020 is a wasteful number, since it uses less digits than its factorization.

21112020120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118411 (or 3118409 counting only the distinct ones).

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

Adding to 21112020120020 its reverse (2002102021112), we get a palindrome (23114122141132).

The spelling of 21112020120020 in words is "twenty-one trillion, one hundred twelve billion, twenty million, one hundred twenty thousand, twenty".