21102122001211 has 4 divisors (see below), whose sum is σ = 21103288075672. Its totient is φ = 21100955926752.

The previous prime is 21102122001139. The next prime is 21102122001251. The reversal of 21102122001211 is 11210022120112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21102122001211 - 2¹⁵ = 21102121968443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102122001251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 583010085 + ... + 583046278.

It is an arithmetic number, because the mean of its divisors is an integer number (5275822018918).

Almost surely, 2^{21102122001211} is an apocalyptic number.

21102122001211 is a deficient number, since it is larger than the sum of its proper divisors (1166074461).

21102122001211 is a wasteful number, since it uses less digits than its factorization.

21102122001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166074460.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21102122001211 its reverse (11210022120112), we get a palindrome (32312144121323).

The spelling of 21102122001211 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-two million, one thousand, two hundred eleven".