21021110020002 has 16 divisors (see below), whose sum is σ = 42285238655040. Its totient is φ = 6966533570832.

The previous prime is 21021110019983. The next prime is 21021110020063. The reversal of 21021110020002 is 20002001112012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021110020002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10125774502 + ... + 10125776577.

It is an arithmetic number, because the mean of its divisors is an integer number (2642827415940).

Almost surely, 2^{21021110020002} is an apocalyptic number.

21021110020002 is an abundant number, since it is smaller than the sum of its proper divisors (21264128635038).

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

21021110020002 is a wasteful number, since it uses less digits than its factorization.

21021110020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20251551257.

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

Adding to 21021110020002 its reverse (20002001112012), we get a palindrome (41023111132014).

The spelling of 21021110020002 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, twenty thousand, two".