221061625 has 32 divisors (see below), whose sum is σ = 304881408. Its totient is φ = 159174400.

The previous prime is 221061611. The next prime is 221061683. The reversal of 221061625 is 526160122.

It is not a de Polignac number, because 221061625 - 2⁷ = 221061497 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 self number, because there is not a number n which added to its sum of digits gives 221061625.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46614 + ... + 51136.

It is an arithmetic number, because the mean of its divisors is an integer number (9527544).

Almost surely, 2^221061625 is an apocalyptic number.

221061625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221061625 is a deficient number, since it is larger than the sum of its proper divisors (83819783).

221061625 is a wasteful number, since it uses less digits than its factorization.

221061625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578 (or 4568 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 221061625 is about 14868.1412758959. The cubic root of 221061625 is about 604.6505506493.

The spelling of 221061625 in words is "two hundred twenty-one million, sixty-one thousand, six hundred twenty-five".