21535041355525 has 12 divisors (see below), whose sum is σ = 26715230553312. Its totient is φ = 17220433553840.

The previous prime is 21535041355511. The next prime is 21535041355547. The reversal of 21535041355525 is 52555314053512.

It is not a de Polignac number, because 21535041355525 - 2⁷ = 21535041355397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 189930457 + ... + 190043806.

It is an arithmetic number, because the mean of its divisors is an integer number (2226269212776).

Almost surely, 2^{21535041355525} is an apocalyptic number.

21535041355525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21535041355525 is a deficient number, since it is larger than the sum of its proper divisors (5180189197787).

21535041355525 is a wasteful number, since it uses less digits than its factorization.

21535041355525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379976540 (or 379976535 counting only the distinct ones).

The product of its (nonzero) digits is 2250000, while the sum is 46.

The spelling of 21535041355525 in words is "twenty-one trillion, five hundred thirty-five billion, forty-one million, three hundred fifty-five thousand, five hundred twenty-five".