21012021011131 has 2 divisors, whose sum is σ = 21012021011132. Its totient is φ = 21012021011130.

The previous prime is 21012021011123. The next prime is 21012021011213. The reversal of 21012021011131 is 13111012021012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012021011131 - 2³ = 21012021011123 is a prime.

It is a super-2 number, since 2×21012021011131² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21012021081131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506010505565 + 10506010505566.

It is an arithmetic number, because the mean of its divisors is an integer number (10506010505566).

Almost surely, 2^{21012021011131} is an apocalyptic number.

21012021011131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012021011131 is an equidigital number, since it uses as much as digits as its factorization.

21012021011131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21012021011131 its reverse (13111012021012), we get a palindrome (34123033032143).

The spelling of 21012021011131 in words is "twenty-one trillion, twelve billion, twenty-one million, eleven thousand, one hundred thirty-one".