21097990963 has 8 divisors (see below), whose sum is σ = 25381041920. Its totient is φ = 17132203080.

The previous prime is 21097990961. The next prime is 21097990973. The reversal of 21097990963 is 36909979012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21097990963 - 2¹ = 21097990961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21097990961) 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, 79315623 + ... + 79315888.

It is an arithmetic number, because the mean of its divisors is an integer number (3172630240).

Almost surely, 2^21097990963 is an apocalyptic number.

21097990963 is a deficient number, since it is larger than the sum of its proper divisors (4283050957).

21097990963 is a wasteful number, since it uses less digits than its factorization.

21097990963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158631537.

The product of its (nonzero) digits is 1653372, while the sum is 55.

The spelling of 21097990963 in words is "twenty-one billion, ninety-seven million, nine hundred ninety thousand, nine hundred sixty-three".