21706306996 has 24 divisors (see below), whose sum is σ = 43876921536. Its totient is φ = 9286120320.

The previous prime is 21706306931. The next prime is 21706306997. The reversal of 21706306996 is 69960360712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706306997) 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, 14508816 + ... + 14510311.

It is an arithmetic number, because the mean of its divisors is an integer number (1828205064).

Almost surely, 2^21706306996 is an apocalyptic number.

It is an amenable number.

21706306996 is an abundant number, since it is smaller than the sum of its proper divisors (22170614540).

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

21706306996 is a wasteful number, since it uses less digits than its factorization.

21706306996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29019159 (or 29019157 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 21706306996 in words is "twenty-one billion, seven hundred six million, three hundred six thousand, nine hundred ninety-six".