21274551017431 has 2 divisors, whose sum is σ = 21274551017432. Its totient is φ = 21274551017430.

The previous prime is 21274551017411. The next prime is 21274551017539. The reversal of 21274551017431 is 13471015547212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21274551017431 - 2⁵ = 21274551017399 is a prime.

It is a super-2 number, since 2×21274551017431² (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 (21274551017411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637275508715 + 10637275508716.

It is an arithmetic number, because the mean of its divisors is an integer number (10637275508716).

Almost surely, 2^{21274551017431} is an apocalyptic number.

21274551017431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274551017431 is an equidigital number, since it uses as much as digits as its factorization.

21274551017431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 21274551017431 in words is "twenty-one trillion, two hundred seventy-four billion, five hundred fifty-one million, seventeen thousand, four hundred thirty-one".