21540271257031 has 2 divisors, whose sum is σ = 21540271257032. Its totient is φ = 21540271257030.

The previous prime is 21540271257013. The next prime is 21540271257053. The reversal of 21540271257031 is 13075217204512.

It is a happy number.

Together with previous prime (21540271257013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21540271257031 - 2²¹ = 21540269159879 is a prime.

It is a super-2 number, since 2×21540271257031² (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 (21540271257431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10770135628515 + 10770135628516.

It is an arithmetic number, because the mean of its divisors is an integer number (10770135628516).

Almost surely, 2^{21540271257031} is an apocalyptic number.

21540271257031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21540271257031 is an equidigital number, since it uses as much as digits as its factorization.

21540271257031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 21540271257031 in words is "twenty-one trillion, five hundred forty billion, two hundred seventy-one million, two hundred fifty-seven thousand, thirty-one".