21548723960 has 16 divisors (see below), whose sum is σ = 48484629000. Its totient is φ = 8619489568.

The previous prime is 21548723957. The next prime is 21548724013. The reversal of 21548723960 is 6932784512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269359010 + ... + 269359089.

It is a 1-persistent number, because it is pandigital, but 2⋅21548723960 = 43097447920 is not.

Almost surely, 2^21548723960 is an apocalyptic number.

21548723960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21548723960 is an abundant number, since it is smaller than the sum of its proper divisors (26935905040).

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

21548723960 is a wasteful number, since it uses less digits than its factorization.

21548723960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538718110 (or 538718106 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 21548723960 in words is "twenty-one billion, five hundred forty-eight million, seven hundred twenty-three thousand, nine hundred sixty".