21316035538 has 16 divisors (see below), whose sum is σ = 36543691584. Its totient is φ = 9134964720.

The previous prime is 21316035511. The next prime is 21316035583. The reversal of 21316035538 is 83553061312.

It is a junction number, because it is equal to n+sod(n) for n = 21316035497 and 21316035506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416493 + ... + 464863.

It is an arithmetic number, because the mean of its divisors is an integer number (2283980724).

Almost surely, 2^21316035538 is an apocalyptic number.

21316035538 is a deficient number, since it is larger than the sum of its proper divisors (15227656046).

21316035538 is a wasteful number, since it uses less digits than its factorization.

21316035538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79857.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21316035538 in words is "twenty-one billion, three hundred sixteen million, thirty-five thousand, five hundred thirty-eight".