21021220202010 has 64 divisors (see below), whose sum is σ = 58252618513152. Its totient is φ = 4755315787776.

The previous prime is 21021220201981. The next prime is 21021220202041. The reversal of 21021220202010 is 1020202212012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 515964417 + ... + 516005156.

It is an arithmetic number, because the mean of its divisors is an integer number (910197164268).

Almost surely, 2^{21021220202010} is an apocalyptic number.

21021220202010 is an abundant number, since it is smaller than the sum of its proper divisors (37231398311142).

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

21021220202010 is a wasteful number, since it uses less digits than its factorization.

21021220202010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031969687.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21021220202010 its reverse (1020202212012), we get a palindrome (22041422414022).

The spelling of 21021220202010 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, two hundred two thousand, ten".