88215921 has 6 divisors (see below), whose sum is σ = 127423010. Its totient is φ = 58810608.

The previous prime is 88215893. The next prime is 88215923. The reversal of 88215921 is 12951288.

It can be written as a sum of positive squares in only one way, i.e., 80730225 + 7485696 = 8985^2 + 2736^2 .

It is not a de Polignac number, because 88215921 - 2⁵ = 88215889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88215923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4900876 + ... + 4900893.

Almost surely, 2^88215921 is an apocalyptic number.

It is an amenable number.

88215921 is a deficient number, since it is larger than the sum of its proper divisors (39207089).

88215921 is a wasteful number, since it uses less digits than its factorization.

88215921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9801775 (or 9801772 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 88215921 is about 9392.3330967337. Note that the first 3 decimals coincide. The cubic root of 88215921 is about 445.1595118935.

The spelling of 88215921 in words is "eighty-eight million, two hundred fifteen thousand, nine hundred twenty-one".