21961948884 has 24 divisors (see below), whose sum is σ = 52897598208. Its totient is φ = 7084499520.

The previous prime is 21961948873. The next prime is 21961948891. The reversal of 21961948884 is 48884916912.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 29518377 + ... + 29519120.

It is an arithmetic number, because the mean of its divisors is an integer number (2204066592).

Almost surely, 2^21961948884 is an apocalyptic number.

It is an amenable number.

21961948884 is an abundant number, since it is smaller than the sum of its proper divisors (30935649324).

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

21961948884 is a wasteful number, since it uses less digits than its factorization.

21961948884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59037535 (or 59037533 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 60.

The spelling of 21961948884 in words is "twenty-one billion, nine hundred sixty-one million, nine hundred forty-eight thousand, eight hundred eighty-four".