21896488215 has 112 divisors (see below), whose sum is σ = 45374224896. Its totient is φ = 9931896000.

The previous prime is 21896488177. The next prime is 21896488241. The reversal of 21896488215 is 51288469812.

It is not a de Polignac number, because 21896488215 - 2¹² = 21896484119 is a prime.

It is a super-2 number, since 2×21896488215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 3339190 + ... + 3345740.

It is an arithmetic number, because the mean of its divisors is an integer number (405127008).

Almost surely, 2^21896488215 is an apocalyptic number.

21896488215 is an abundant number, since it is smaller than the sum of its proper divisors (23477736681).

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

21896488215 is an equidigital number, since it uses as much as digits as its factorization.

21896488215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6712 (or 6697 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The spelling of 21896488215 in words is "twenty-one billion, eight hundred ninety-six million, four hundred eighty-eight thousand, two hundred fifteen".