21315540016 has 40 divisors (see below), whose sum is σ = 42330237120. Its totient is φ = 10393250304.

The previous prime is 21315540011. The next prime is 21315540023. The reversal of 21315540016 is 61004551312.

It is not an unprimeable number, because it can be changed into a prime (21315540011) 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, 157140 + ... + 259468.

It is an arithmetic number, because the mean of its divisors is an integer number (1058255928).

Almost surely, 2^21315540016 is an apocalyptic number.

It is an amenable number.

21315540016 is a deficient number, since it is larger than the sum of its proper divisors (21014697104).

21315540016 is a wasteful number, since it uses less digits than its factorization.

21315540016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102661 (or 102655 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 21315540016 in words is "twenty-one billion, three hundred fifteen million, five hundred forty thousand, sixteen".