21625198207 has 4 divisors (see below), whose sum is σ = 22565424240. Its totient is φ = 20684972176.

The previous prime is 21625198163. The next prime is 21625198223. The reversal of 21625198207 is 70289152612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21625198207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625198237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470112982 + ... + 470113027.

It is an arithmetic number, because the mean of its divisors is an integer number (5641356060).

Almost surely, 2^21625198207 is an apocalyptic number.

21625198207 is a deficient number, since it is larger than the sum of its proper divisors (940226033).

21625198207 is an equidigital number, since it uses as much as digits as its factorization.

21625198207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940226032.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 21625198207 in words is "twenty-one billion, six hundred twenty-five million, one hundred ninety-eight thousand, two hundred seven".