21702922187 has 4 divisors (see below), whose sum is σ = 21703436496. Its totient is φ = 21702407880.

The previous prime is 21702922181. The next prime is 21702922207. The reversal of 21702922187 is 78122920712.

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

It is a cyclic number.

It is not a de Polignac number, because 21702922187 - 2⁶ = 21702922123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21702922181) 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, 187583 + ... + 280344.

It is an arithmetic number, because the mean of its divisors is an integer number (5425859124).

Almost surely, 2^21702922187 is an apocalyptic number.

21702922187 is a deficient number, since it is larger than the sum of its proper divisors (514309).

21702922187 is an equidigital number, since it uses as much as digits as its factorization.

21702922187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514308.

The product of its (nonzero) digits is 56448, while the sum is 41.

The spelling of 21702922187 in words is "twenty-one billion, seven hundred two million, nine hundred twenty-two thousand, one hundred eighty-seven".