221373425 has 36 divisors (see below), whose sum is σ = 343907676. Its totient is φ = 140112000.

The previous prime is 221373409. The next prime is 221373437. The reversal of 221373425 is 524373122.

It can be written as a sum of positive squares in 6 ways, for example, as 6105841 + 215267584 = 2471^2 + 14672^2 .

It is not a de Polignac number, because 221373425 - 2⁴ = 221373409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8975 + ... + 22875.

It is an arithmetic number, because the mean of its divisors is an integer number (9552991).

Almost surely, 2^221373425 is an apocalyptic number.

221373425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221373425 is a deficient number, since it is larger than the sum of its proper divisors (122534251).

221373425 is a wasteful number, since it uses less digits than its factorization.

221373425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13938 (or 13926 counting only the distinct ones).

The product of its digits is 10080, while the sum is 29.

The square root of 221373425 is about 14878.6230881759. The cubic root of 221373425 is about 604.9346968652.

The spelling of 221373425 in words is "two hundred twenty-one million, three hundred seventy-three thousand, four hundred twenty-five".