21321202002 has 8 divisors (see below), whose sum is σ = 42642404016. Its totient is φ = 7107067332.

The previous prime is 21321201991. The next prime is 21321202003. The reversal of 21321202002 is 20020212312.

It is a happy number.

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

21321202002 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21321202003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1776766828 + ... + 1776766839.

It is an arithmetic number, because the mean of its divisors is an integer number (5330300502).

Almost surely, 2^21321202002 is an apocalyptic number.

21321202002 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.

21321202002 is a wasteful number, since it uses less digits than its factorization.

21321202002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553533672.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21321202002 its reverse (20020212312), we get a palindrome (41341414314).

The spelling of 21321202002 in words is "twenty-one billion, three hundred twenty-one million, two hundred two thousand, two".