1021205204 has 12 divisors (see below), whose sum is σ = 1830697428. Its totient is φ = 498148800.

The previous prime is 1021205197. The next prime is 1021205231. The reversal of 1021205204 is 4025021201.

It can be written as a sum of positive squares in 2 ways, for example, as 304572304 + 716632900 = 17452^2 + 26770^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3113267 + ... + 3113594.

It is an arithmetic number, because the mean of its divisors is an integer number (152558119).

Almost surely, 2^1021205204 is an apocalyptic number.

It is an amenable number.

1021205204 is a deficient number, since it is larger than the sum of its proper divisors (809492224).

1021205204 is a wasteful number, since it uses less digits than its factorization.

1021205204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226906 (or 6226904 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1021205204 is about 31956.3014756088. The cubic root of 1021205204 is about 1007.0190194317.

Adding to 1021205204 its reverse (4025021201), we get a palindrome (5046226405).

The spelling of 1021205204 in words is "one billion, twenty-one million, two hundred five thousand, two hundred four".