210990004 has 6 divisors (see below), whose sum is σ = 369232514. Its totient is φ = 105495000.

The previous prime is 210989981. The next prime is 210990007. The reversal of 210990004 is 400099012.

It can be written as a sum of positive squares in only one way, i.e., 200165904 + 10824100 = 14148^2 + 3290^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210990007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26373747 + ... + 26373754.

Almost surely, 2^210990004 is an apocalyptic number.

It is an amenable number.

210990004 is a deficient number, since it is larger than the sum of its proper divisors (158242510).

210990004 is a wasteful number, since it uses less digits than its factorization.

210990004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52747505 (or 52747503 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 210990004 is about 14525.4949657490. The cubic root of 210990004 is about 595.3247799641.

The spelling of 210990004 in words is "two hundred ten million, nine hundred ninety thousand, four".