21510453655013 has 8 divisors (see below), whose sum is σ = 21525436134048. Its totient is φ = 21495471822864.

The previous prime is 21510453654983. The next prime is 21510453655043. The reversal of 21510453655013 is 31055635401512.

It is an interprime number because it is at equal distance from previous prime (21510453654983) and next prime (21510453655043).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21510453655013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510453655043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80189831 + ... + 80457627.

It is an arithmetic number, because the mean of its divisors is an integer number (2690679516756).

Almost surely, 2^{21510453655013} is an apocalyptic number.

It is an amenable number.

21510453655013 is a deficient number, since it is larger than the sum of its proper divisors (14982479035).

21510453655013 is a wasteful number, since it uses less digits than its factorization.

21510453655013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323443.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 21510453655013 in words is "twenty-one trillion, five hundred ten billion, four hundred fifty-three million, six hundred fifty-five thousand, thirteen".