21551313124535 has 4 divisors (see below), whose sum is σ = 25861575749448. Its totient is φ = 17241050499624.

The previous prime is 21551313124529. The next prime is 21551313124631. The reversal of 21551313124535 is 53542131315512.

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 21551313124535 - 2⁴ = 21551313124519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21551313124492 and 21551313124501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155131312449 + ... + 2155131312458.

It is an arithmetic number, because the mean of its divisors is an integer number (6465393937362).

Almost surely, 2^{21551313124535} is an apocalyptic number.

21551313124535 is a deficient number, since it is larger than the sum of its proper divisors (4310262624913).

21551313124535 is an equidigital number, since it uses as much as digits as its factorization.

21551313124535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4310262624912.

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

The spelling of 21551313124535 in words is "twenty-one trillion, five hundred fifty-one billion, three hundred thirteen million, one hundred twenty-four thousand, five hundred thirty-five".