21153014355631 has 4 divisors (see below), whose sum is σ = 21231650097000. Its totient is φ = 21074378614264.

The previous prime is 21153014355611. The next prime is 21153014355637. The reversal of 21153014355631 is 13655341035112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21153014355631 - 2³¹ = 21150866871983 is a prime.

It is a super-2 number, since 2×21153014355631² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153014355637) 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 in 3 ways as a sum of consecutive naturals, for example, 39317870281 + ... + 39317870818.

It is an arithmetic number, because the mean of its divisors is an integer number (5307912524250).

Almost surely, 2^{21153014355631} is an apocalyptic number.

21153014355631 is a deficient number, since it is larger than the sum of its proper divisors (78635741369).

21153014355631 is an equidigital number, since it uses as much as digits as its factorization.

21153014355631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78635741368.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 21153014355631 in words is "twenty-one trillion, one hundred fifty-three billion, fourteen million, three hundred fifty-five thousand, six hundred thirty-one".