21573910354 has 16 divisors (see below), whose sum is σ = 34572492000. Its totient is φ = 10066693824.

The previous prime is 21573910339. The next prime is 21573910357. The reversal of 21573910354 is 45301937512.

It is not an unprimeable number, because it can be changed into a prime (21573910357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4234279 + ... + 4239370.

It is an arithmetic number, because the mean of its divisors is an integer number (2160780750).

Almost surely, 2^21573910354 is an apocalyptic number.

21573910354 is a deficient number, since it is larger than the sum of its proper divisors (12998581646).

21573910354 is a wasteful number, since it uses less digits than its factorization.

21573910354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473737.

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 21573910354 in words is "twenty-one billion, five hundred seventy-three million, nine hundred ten thousand, three hundred fifty-four".