21221012201210 has 8 divisors (see below), whose sum is σ = 38197821962196. Its totient is φ = 8488404880480.

The previous prime is 21221012201203. The next prime is 21221012201219. The reversal of 21221012201210 is 1210221012212.

It can be written as a sum of positive squares in 2 ways, for example, as 21207526256569 + 13485944641 = 4605163^2 + 116129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21221012201219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061050610051 + ... + 1061050610070.

Almost surely, 2^{21221012201210} is an apocalyptic number.

21221012201210 is a deficient number, since it is larger than the sum of its proper divisors (16976809760986).

21221012201210 is a wasteful number, since it uses less digits than its factorization.

21221012201210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122101220128.

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

Adding to 21221012201210 its reverse (1210221012212), we get a palindrome (22431233213422).

The spelling of 21221012201210 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, two hundred one thousand, two hundred ten".