21210209011051 has 2 divisors, whose sum is σ = 21210209011052. Its totient is φ = 21210209011050.

The previous prime is 21210209011031. The next prime is 21210209011087. The reversal of 21210209011051 is 15011090201212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210209011051 - 2⁷ = 21210209010923 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210209011021) 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 as a sum of consecutive naturals, namely, 10605104505525 + 10605104505526.

It is an arithmetic number, because the mean of its divisors is an integer number (10605104505526).

Almost surely, 2^{21210209011051} is an apocalyptic number.

21210209011051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210209011051 is an equidigital number, since it uses as much as digits as its factorization.

21210209011051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 25.

Adding to 21210209011051 its reverse (15011090201212), we get a palindrome (36221299212263).

The spelling of 21210209011051 in words is "twenty-one trillion, two hundred ten billion, two hundred nine million, eleven thousand, fifty-one".