21201220202010 has 32 divisors (see below), whose sum is σ = 52637512227840. Its totient is φ = 5458704971328.

The previous prime is 21201220202009. The next prime is 21201220202047. The reversal of 21201220202010 is 1020202210212.

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 15 ways as a sum of consecutive naturals, for example, 12184608442 + ... + 12184610181.

It is an arithmetic number, because the mean of its divisors is an integer number (1644922257120).

Almost surely, 2^{21201220202010} is an apocalyptic number.

21201220202010 is an abundant number, since it is smaller than the sum of its proper divisors (31436292025830).

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

21201220202010 is a wasteful number, since it uses less digits than its factorization.

21201220202010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24369218662.

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

Adding to 21201220202010 its reverse (1020202210212), we get a palindrome (22221422412222).

The spelling of 21201220202010 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred two thousand, ten".