21154662110431 has 2 divisors, whose sum is σ = 21154662110432. Its totient is φ = 21154662110430.

The previous prime is 21154662110371. The next prime is 21154662110437. The reversal of 21154662110431 is 13401126645112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21154662110431 - 2¹⁷ = 21154661979359 is a prime.

It is a super-2 number, since 2×21154662110431² (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 (21154662110437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577331055215 + 10577331055216.

It is an arithmetic number, because the mean of its divisors is an integer number (10577331055216).

Almost surely, 2^{21154662110431} is an apocalyptic number.

21154662110431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154662110431 is an equidigital number, since it uses as much as digits as its factorization.

21154662110431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

Adding to 21154662110431 its reverse (13401126645112), we get a palindrome (34555788755543).

The spelling of 21154662110431 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-two million, one hundred ten thousand, four hundred thirty-one".