21570525338 has 8 divisors (see below), whose sum is σ = 33399523200. Its totient is φ = 10437350940.

The previous prime is 21570525337. The next prime is 21570525341. The reversal of 21570525338 is 83352507512.

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

It is a junction number, because it is equal to n+sod(n) for n = 21570525295 and 21570525304.

It is not an unprimeable number, because it can be changed into a prime (21570525337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173955788 + ... + 173955911.

It is an arithmetic number, because the mean of its divisors is an integer number (4174940400).

Almost surely, 2^21570525338 is an apocalyptic number.

21570525338 is a deficient number, since it is larger than the sum of its proper divisors (11828997862).

21570525338 is a wasteful number, since it uses less digits than its factorization.

21570525338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347911732.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 21570525338 in words is "twenty-one billion, five hundred seventy million, five hundred twenty-five thousand, three hundred thirty-eight".