21998739522 has 8 divisors (see below), whose sum is σ = 43997479056. Its totient is φ = 7332913172.

The previous prime is 21998739481. The next prime is 21998739523. The reversal of 21998739522 is 22593789912.

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

21998739522 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21998739523) 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, 1833228288 + ... + 1833228299.

It is an arithmetic number, because the mean of its divisors is an integer number (5499684882).

Almost surely, 2^21998739522 is an apocalyptic number.

21998739522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21998739522 is a wasteful number, since it uses less digits than its factorization.

21998739522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666456592.

The product of its digits is 4898880, while the sum is 57.

The spelling of 21998739522 in words is "twenty-one billion, nine hundred ninety-eight million, seven hundred thirty-nine thousand, five hundred twenty-two".