21221012120201 has 32 divisors (see below), whose sum is σ = 22186881024000. Its totient is φ = 20274232530240.

The previous prime is 21221012120177. The next prime is 21221012120227. The reversal of 21221012120201 is 10202121012212.

It is a cyclic number.

It is not a de Polignac number, because 21221012120201 - 2⁶ = 21221012120137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221012120201.

It is not an unprimeable number, because it can be changed into a prime (21221012120291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058552960 + ... + 1058573006.

It is an arithmetic number, because the mean of its divisors is an integer number (693340032000).

Almost surely, 2^{21221012120201} is an apocalyptic number.

It is an amenable number.

21221012120201 is a deficient number, since it is larger than the sum of its proper divisors (965868903799).

21221012120201 is a wasteful number, since it uses less digits than its factorization.

21221012120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21309.

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

Adding to 21221012120201 its reverse (10202121012212), we get a palindrome (31423133132413).

The spelling of 21221012120201 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred twenty thousand, two hundred one".