21201211220210 has 32 divisors (see below), whose sum is σ = 44541875980800. Its totient is φ = 7114327411392.

The previous prime is 21201211220201. The next prime is 21201211220213. The reversal of 21201211220210 is 1202211210212.

It is a super-2 number, since 2×21201211220210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201211220213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3222065285 + ... + 3222071864.

It is an arithmetic number, because the mean of its divisors is an integer number (1391933624400).

Almost surely, 2^{21201211220210} is an apocalyptic number.

21201211220210 is an abundant number, since it is smaller than the sum of its proper divisors (23340664760590).

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

21201211220210 is a wasteful number, since it uses less digits than its factorization.

21201211220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444137210.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201211220210 its reverse (1202211210212), we get a palindrome (22403422430422).

The spelling of 21201211220210 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, two hundred twenty thousand, two hundred ten".