21020121200131 has 2 divisors, whose sum is σ = 21020121200132. Its totient is φ = 21020121200130.

The previous prime is 21020121200093. The next prime is 21020121200257. The reversal of 21020121200131 is 13100212102012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020121200131 - 2¹⁵ = 21020121167363 is a prime.

It is a super-2 number, since 2×21020121200131² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21020121206131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510060600065 + 10510060600066.

It is an arithmetic number, because the mean of its divisors is an integer number (10510060600066).

Almost surely, 2^{21020121200131} is an apocalyptic number.

21020121200131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020121200131 is an equidigital number, since it uses as much as digits as its factorization.

21020121200131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21020121200131 its reverse (13100212102012), we get a palindrome (34120333302143).

The spelling of 21020121200131 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred thousand, one hundred thirty-one".