21995111488 has 28 divisors (see below), whose sum is σ = 49881771712. Its totient is φ = 9426476160.

The previous prime is 21995111471. The next prime is 21995111491. The reversal of 21995111488 is 88411159912.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24547668 + ... + 24548563.

Almost surely, 2^21995111488 is an apocalyptic number.

21995111488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21995111488 is an abundant number, since it is smaller than the sum of its proper divisors (27886660224).

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

21995111488 is an equidigital number, since it uses as much as digits as its factorization.

21995111488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49096250 (or 49096240 counting only the distinct ones).

The product of its digits is 207360, while the sum is 49.

The spelling of 21995111488 in words is "twenty-one billion, nine hundred ninety-five million, one hundred eleven thousand, four hundred eighty-eight".