2215525621 has 4 divisors (see below), whose sum is σ = 2262664512. Its totient is φ = 2168386732.

The previous prime is 2215525603. The next prime is 2215525699. The reversal of 2215525621 is 1265255122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2215525621 - 2⁵ = 2215525589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215525601) 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, 23569375 + ... + 23569468.

It is an arithmetic number, because the mean of its divisors is an integer number (565666128).

Almost surely, 2^2215525621 is an apocalyptic number.

It is an amenable number.

2215525621 is a deficient number, since it is larger than the sum of its proper divisors (47138891).

2215525621 is an equidigital number, since it uses as much as digits as its factorization.

2215525621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47138890.

The product of its digits is 12000, while the sum is 31.

The square root of 2215525621 is about 47069.3703059644. The cubic root of 2215525621 is about 1303.6437461081.

The spelling of 2215525621 in words is "two billion, two hundred fifteen million, five hundred twenty-five thousand, six hundred twenty-one".