21147570516 has 48 divisors (see below), whose sum is σ = 50009053248. Its totient is φ = 6954854400.

The previous prime is 21147570491. The next prime is 21147570517. The reversal of 21147570516 is 61507574112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147570517) 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, 233076 + ... + 310836.

It is an arithmetic number, because the mean of its divisors is an integer number (1041855276).

Almost surely, 2^21147570516 is an apocalyptic number.

It is an amenable number.

21147570516 is an abundant number, since it is smaller than the sum of its proper divisors (28861482732).

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

21147570516 is a wasteful number, since it uses less digits than its factorization.

21147570516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78072 (or 78070 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 39.

The spelling of 21147570516 in words is "twenty-one billion, one hundred forty-seven million, five hundred seventy thousand, five hundred sixteen".