221256025 has 12 divisors (see below), whose sum is σ = 280196352. Its totient is φ = 173237840.

The previous prime is 221256023. The next prime is 221256059. The reversal of 221256025 is 520652122.

It is a happy number.

It is not a de Polignac number, because 221256025 - 2¹ = 221256023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221256023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92977 + ... + 95326.

It is an arithmetic number, because the mean of its divisors is an integer number (23349696).

Almost surely, 2^221256025 is an apocalyptic number.

221256025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221256025 is a deficient number, since it is larger than the sum of its proper divisors (58940327).

221256025 is a wasteful number, since it uses less digits than its factorization.

221256025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188360 (or 188355 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 221256025 is about 14874.6773074242. The cubic root of 221256025 is about 604.8277404986.

The spelling of 221256025 in words is "two hundred twenty-one million, two hundred fifty-six thousand, twenty-five".