21088435243578 has 16 divisors (see below), whose sum is σ = 42650767909440. Its totient is φ = 6950495510816.

The previous prime is 21088435243523. The next prime is 21088435243607. The reversal of 21088435243578 is 87534253488012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19745725350 + ... + 19745726417.

It is an arithmetic number, because the mean of its divisors is an integer number (2665672994340).

Almost surely, 2^{21088435243578} is an apocalyptic number.

21088435243578 is an abundant number, since it is smaller than the sum of its proper divisors (21562332665862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21088435243578 is a wasteful number, since it uses less digits than its factorization.

21088435243578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39491451861.

The product of its (nonzero) digits is 51609600, while the sum is 60.

The spelling of 21088435243578 in words is "twenty-one trillion, eighty-eight billion, four hundred thirty-five million, two hundred forty-three thousand, five hundred seventy-eight".