204030621 has 24 divisors (see below), whose sum is σ = 298116000. Its totient is φ = 134460000.

The previous prime is 204030613. The next prime is 204030643. The reversal of 204030621 is 126030402.

204030621 = 374² + 375² + ... + 872².

It is a happy number.

204030621 is a `hidden beast` number, since 2 + 0 + 40 + 3 + 0 + 621 = 666.

It is not a de Polignac number, because 204030621 - 2³ = 204030613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204030594 and 204030603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204035621) 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, 408630 + ... + 409128.

It is an arithmetic number, because the mean of its divisors is an integer number (12421500).

Almost surely, 2^204030621 is an apocalyptic number.

It is an amenable number.

204030621 is a deficient number, since it is larger than the sum of its proper divisors (94085379).

204030621 is a wasteful number, since it uses less digits than its factorization.

204030621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 204030621 is about 14283.9287662744. The cubic root of 204030621 is about 588.7059842410.

The spelling of 204030621 in words is "two hundred four million, thirty thousand, six hundred twenty-one".