21702289194 has 24 divisors (see below), whose sum is σ = 47549962980. Its totient is φ = 7152813888.

The previous prime is 21702289187. The next prime is 21702289223. The reversal of 21702289194 is 49198220712.

It can be written as a sum of positive squares in 2 ways, for example, as 21188586969 + 513702225 = 145563^2 + 22665^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6771897 + ... + 6775100.

Almost surely, 2^21702289194 is an apocalyptic number.

21702289194 is an abundant number, since it is smaller than the sum of its proper divisors (25847673786).

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

21702289194 is a wasteful number, since it uses less digits than its factorization.

21702289194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13547094 (or 13547091 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 21702289194 in words is "twenty-one billion, seven hundred two million, two hundred eighty-nine thousand, one hundred ninety-four".