21396036916 has 24 divisors (see below), whose sum is σ = 39273244416. Its totient is φ = 10187413920.

The previous prime is 21396036889. The next prime is 21396036917. The reversal of 21396036916 is 61963069312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21396036917) 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, 1531000 + ... + 1544911.

It is an arithmetic number, because the mean of its divisors is an integer number (1636385184).

Almost surely, 2^21396036916 is an apocalyptic number.

It is an amenable number.

21396036916 is a deficient number, since it is larger than the sum of its proper divisors (17877207500).

21396036916 is a wasteful number, since it uses less digits than its factorization.

21396036916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075999 (or 3075997 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 46.

The spelling of 21396036916 in words is "twenty-one billion, three hundred ninety-six million, thirty-six thousand, nine hundred sixteen".