21573459250 has 32 divisors (see below), whose sum is σ = 46154878848. Its totient is φ = 7396614000.

The previous prime is 21573459227. The next prime is 21573459251. The reversal of 21573459250 is 5295437512.

It is a happy number.

It is a super-2 number, since 2×21573459250² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21573459197 and 21573459206.

It is not an unprimeable number, because it can be changed into a prime (21573459251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6162096 + ... + 6165595.

It is an arithmetic number, because the mean of its divisors is an integer number (1442339964).

Almost surely, 2^21573459250 is an apocalyptic number.

21573459250 is an abundant number, since it is smaller than the sum of its proper divisors (24581419598).

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

21573459250 is a wasteful number, since it uses less digits than its factorization.

21573459250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12327715 (or 12327705 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 21573459250 in words is "twenty-one billion, five hundred seventy-three million, four hundred fifty-nine thousand, two hundred fifty".