21604540521350 has 24 divisors (see below), whose sum is σ = 40192847329440. Its totient is φ = 8640009335520.

The previous prime is 21604540521337. The next prime is 21604540521353. The reversal of 21604540521350 is 5312504540612.

It is a super-2 number, since 2×21604540521350² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604540521353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44930285 + ... + 45408584.

It is an arithmetic number, because the mean of its divisors is an integer number (1674701972060).

Almost surely, 2^{21604540521350} is an apocalyptic number.

21604540521350 is a deficient number, since it is larger than the sum of its proper divisors (18588306808090).

21604540521350 is a wasteful number, since it uses less digits than its factorization.

21604540521350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90343664 (or 90343659 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 21604540521350 in words is "twenty-one trillion, six hundred four billion, five hundred forty million, five hundred twenty-one thousand, three hundred fifty".