21201012012210 has 32 divisors (see below), whose sum is σ = 51842474660160. Its totient is φ = 5546931444288.

The previous prime is 21201012012197. The next prime is 21201012012281. The reversal of 21201012012210 is 1221021010212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21201012012210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6666983320 + ... + 6666986499.

It is an arithmetic number, because the mean of its divisors is an integer number (1620077333130).

Almost surely, 2^{21201012012210} is an apocalyptic number.

21201012012210 is an abundant number, since it is smaller than the sum of its proper divisors (30641462647950).

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

21201012012210 is a wasteful number, since it uses less digits than its factorization.

21201012012210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13333969882.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201012012210 its reverse (1221021010212), we get a palindrome (22422033022422).

The spelling of 21201012012210 in words is "twenty-one trillion, two hundred one billion, twelve million, twelve thousand, two hundred ten".