21021112002 has 32 divisors (see below), whose sum is σ = 45909400320. Its totient is φ = 6363762320.

The previous prime is 21021111959. The next prime is 21021112003. The reversal of 21021112002 is 20021112012.

It is not an unprimeable number, because it can be changed into a prime (21021112003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89028 + ... + 223535.

It is an arithmetic number, because the mean of its divisors is an integer number (1434668760).

Almost surely, 2^21021112002 is an apocalyptic number.

21021112002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021112002 is an abundant number, since it is smaller than the sum of its proper divisors (24888288318).

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

21021112002 is a wasteful number, since it uses less digits than its factorization.

21021112002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313598.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021112002 its reverse (20021112012), we get a palindrome (41042224014).

The spelling of 21021112002 in words is "twenty-one billion, twenty-one million, one hundred twelve thousand, two".