21021112122 has 8 divisors (see below), whose sum is σ = 42042224256. Its totient is φ = 7007037372.

The previous prime is 21021112111. The next prime is 21021112163. The reversal of 21021112122 is 22121112012.

It is a sphenic number, since it is the product of 3 distinct primes.

21021112122 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751759338 + ... + 1751759349.

It is an arithmetic number, because the mean of its divisors is an integer number (5255278032).

Almost surely, 2^21021112122 is an apocalyptic number.

21021112122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21021112122 is a wasteful number, since it uses less digits than its factorization.

21021112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503518692.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021112122 its reverse (22121112012), we get a palindrome (43142224134).

The spelling of 21021112122 in words is "twenty-one billion, twenty-one million, one hundred twelve thousand, one hundred twenty-two".