221936025 has 24 divisors (see below), whose sum is σ = 369383104. Its totient is φ = 117576000.

The previous prime is 221936009. The next prime is 221936041. The reversal of 221936025 is 520639122.

It is an interprime number because it is at equal distance from previous prime (221936009) and next prime (221936041).

It is not a de Polignac number, because 221936025 - 2⁴ = 221936009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221935983 and 221936001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1527 + ... + 21123.

Almost surely, 2^221936025 is an apocalyptic number.

221936025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221936025 is a deficient number, since it is larger than the sum of its proper divisors (147447079).

221936025 is a wasteful number, since it uses less digits than its factorization.

221936025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19761 (or 19756 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 221936025 is about 14897.5174106292. The cubic root of 221936025 is about 605.4467251357.

The spelling of 221936025 in words is "two hundred twenty-one million, nine hundred thirty-six thousand, twenty-five".