21120121022 has 48 divisors (see below), whose sum is σ = 43295221872. Its totient is φ = 7595642880.

The previous prime is 21120121021. The next prime is 21120121039. The reversal of 21120121022 is 22012102112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21120120988 and 21120121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120121021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 739523 + ... + 767550.

It is an arithmetic number, because the mean of its divisors is an integer number (901983789).

Almost surely, 2^21120121022 is an apocalyptic number.

21120121022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21120121022 is an abundant number, since it is smaller than the sum of its proper divisors (22175100850).

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

21120121022 is a wasteful number, since it uses less digits than its factorization.

21120121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507113 (or 1507106 counting only the distinct ones).

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

Adding to 21120121022 its reverse (22012102112), we get a palindrome (43132223134).

The spelling of 21120121022 in words is "twenty-one billion, one hundred twenty million, one hundred twenty-one thousand, twenty-two".