21126353302531 has 2 divisors, whose sum is σ = 21126353302532. Its totient is φ = 21126353302530.

The previous prime is 21126353302489. The next prime is 21126353302541. The reversal of 21126353302531 is 13520335362112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21126353302531 - 2⁷ = 21126353302403 is a prime.

It is a super-2 number, since 2×21126353302531² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21126353302541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563176651265 + 10563176651266.

It is an arithmetic number, because the mean of its divisors is an integer number (10563176651266).

Almost surely, 2^{21126353302531} is an apocalyptic number.

21126353302531 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126353302531 is an equidigital number, since it uses as much as digits as its factorization.

21126353302531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 37.

Adding to 21126353302531 its reverse (13520335362112), we get a palindrome (34646688664643).

The spelling of 21126353302531 in words is "twenty-one trillion, one hundred twenty-six billion, three hundred fifty-three million, three hundred two thousand, five hundred thirty-one".