21002113122 has 16 divisors (see below), whose sum is σ = 42019309632. Its totient is φ = 6998190480.

The previous prime is 21002113079. The next prime is 21002113129. The reversal of 21002113122 is 22131120012.

It is not an unprimeable number, because it can be changed into a prime (21002113129) 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, 610333 + ... + 643824.

It is an arithmetic number, because the mean of its divisors is an integer number (2626206852).

Almost surely, 2^21002113122 is an apocalyptic number.

21002113122 is an abundant number, since it is smaller than the sum of its proper divisors (21017196510).

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

21002113122 is a wasteful number, since it uses less digits than its factorization.

21002113122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256953.

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

Adding to 21002113122 its reverse (22131120012), we get a palindrome (43133233134).

The spelling of 21002113122 in words is "twenty-one billion, two million, one hundred thirteen thousand, one hundred twenty-two".