21021020211201 has 16 divisors (see below), whose sum is σ = 29246750244864. Its totient is φ = 13404656552144.

The previous prime is 21021020211173. The next prime is 21021020211251. The reversal of 21021020211201 is 10211202012012.

It is a cyclic number.

It is not a de Polignac number, because 21021020211201 - 2²³ = 21021011822593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021020211251) 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, 25829440 + ... + 26630846.

It is an arithmetic number, because the mean of its divisors is an integer number (1827921890304).

Almost surely, 2^{21021020211201} is an apocalyptic number.

It is an amenable number.

21021020211201 is a deficient number, since it is larger than the sum of its proper divisors (8225730033663).

21021020211201 is a wasteful number, since it uses less digits than its factorization.

21021020211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181580.

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

Adding to 21021020211201 its reverse (10211202012012), we get a palindrome (31232222223213).

The spelling of 21021020211201 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred eleven thousand, two hundred one".