21674535121 has 2 divisors, whose sum is σ = 21674535122. Its totient is φ = 21674535120.

The previous prime is 21674535109. The next prime is 21674535173. The reversal of 21674535121 is 12153547612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18834817600 + 2839717521 = 137240^2 + 53289^2 .

It is a cyclic number.

It is not a de Polignac number, because 21674535121 - 2⁵ = 21674535089 is a prime.

It is a super-2 number, since 2×21674535121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21674535191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837267560 + 10837267561.

It is an arithmetic number, because the mean of its divisors is an integer number (10837267561).

Almost surely, 2^21674535121 is an apocalyptic number.

It is an amenable number.

21674535121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674535121 is an equidigital number, since it uses as much as digits as its factorization.

21674535121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The spelling of 21674535121 in words is "twenty-one billion, six hundred seventy-four million, five hundred thirty-five thousand, one hundred twenty-one".