21206502995 has 8 divisors (see below), whose sum is σ = 25449348960. Its totient is φ = 16964172160.

The previous prime is 21206502991. The next prime is 21206503007. The reversal of 21206502995 is 59920560212.

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

It is not a de Polignac number, because 21206502995 - 2² = 21206502991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21206502991) 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, 31535 + ... + 208344.

It is an arithmetic number, because the mean of its divisors is an integer number (3181168620).

Almost surely, 2^21206502995 is an apocalyptic number.

21206502995 is a deficient number, since it is larger than the sum of its proper divisors (4242845965).

21206502995 is a wasteful number, since it uses less digits than its factorization.

21206502995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257565.

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 21206502995 in words is "twenty-one billion, two hundred six million, five hundred two thousand, nine hundred ninety-five".