21121031022 has 64 divisors (see below), whose sum is σ = 52008789504. Its totient is φ = 5568393600.

The previous prime is 21121030993. The next prime is 21121031039. The reversal of 21121031022 is 22013012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121030992 and 21121031010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2128272 + ... + 2138172.

It is an arithmetic number, because the mean of its divisors is an integer number (812637336).

Almost surely, 2^21121031022 is an apocalyptic number.

21121031022 is an abundant number, since it is smaller than the sum of its proper divisors (30887758482).

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

21121031022 is a wasteful number, since it uses less digits than its factorization.

21121031022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13833.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21121031022 its reverse (22013012112), we get a palindrome (43134043134).

The spelling of 21121031022 in words is "twenty-one billion, one hundred twenty-one million, thirty-one thousand, twenty-two".