21121122020 has 48 divisors (see below), whose sum is σ = 44953005888. Its totient is φ = 8335017600.

The previous prime is 21121122017. The next prime is 21121122041. The reversal of 21121122020 is 2022112112.

It is a super-2 number, since 2×21121122020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121121986 and 21121122004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553187 + ... + 590133.

It is an arithmetic number, because the mean of its divisors is an integer number (936520956).

Almost surely, 2^21121122020 is an apocalyptic number.

21121122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121122020 is an abundant number, since it is smaller than the sum of its proper divisors (23831883868).

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

21121122020 is a wasteful number, since it uses less digits than its factorization.

21121122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37340 (or 37338 counting only the distinct ones).

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

Adding to 21121122020 its reverse (2022112112), we get a palindrome (23143234132).

The spelling of 21121122020 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty".