21654760671031 has 2 divisors, whose sum is σ = 21654760671032. Its totient is φ = 21654760671030.

The previous prime is 21654760670989. The next prime is 21654760671043. The reversal of 21654760671031 is 13017606745612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21654760671031 - 2¹⁹ = 21654760146743 is a prime.

It is a super-2 number, since 2×21654760671031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21654760651031) 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, 10827380335515 + 10827380335516.

It is an arithmetic number, because the mean of its divisors is an integer number (10827380335516).

Almost surely, 2^{21654760671031} is an apocalyptic number.

21654760671031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21654760671031 is an equidigital number, since it uses as much as digits as its factorization.

21654760671031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 21654760671031 in words is "twenty-one trillion, six hundred fifty-four billion, seven hundred sixty million, six hundred seventy-one thousand, thirty-one".