30625221 has 24 divisors (see below), whose sum is σ = 45198720. Its totient is φ = 18430720.

The previous prime is 30625187. The next prime is 30625229. The reversal of 30625221 is 12252603.

It is not a de Polignac number, because 30625221 - 2⁹ = 30624709 is a prime.

It is a super-2 number, since 2×30625221² = 1875808322597682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30625229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86581 + ... + 86933.

It is an arithmetic number, because the mean of its divisors is an integer number (1883280).

Almost surely, 2^30625221 is an apocalyptic number.

It is an amenable number.

30625221 is a deficient number, since it is larger than the sum of its proper divisors (14573499).

30625221 is a wasteful number, since it uses less digits than its factorization.

30625221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 30625221 is about 5534.0058727833. The cubic root of 30625221 is about 312.8669898636.

Adding to 30625221 its reverse (12252603), we get a palindrome (42877824).

The spelling of 30625221 in words is "thirty million, six hundred twenty-five thousand, two hundred twenty-one".