21231121022 has 16 divisors (see below), whose sum is σ = 32037815040. Its totient is φ = 10552039128.

The previous prime is 21231120971. The next prime is 21231121027. The reversal of 21231121022 is 22012113212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231121027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178229 + ... + 272447.

It is an arithmetic number, because the mean of its divisors is an integer number (2002363440).

Almost surely, 2^21231121022 is an apocalyptic number.

21231121022 is a deficient number, since it is larger than the sum of its proper divisors (10806694018).

21231121022 is a wasteful number, since it uses less digits than its factorization.

21231121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94895.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21231121022 its reverse (22012113212), we get a palindrome (43243234234).

The spelling of 21231121022 in words is "twenty-one billion, two hundred thirty-one million, one hundred twenty-one thousand, twenty-two".