217251074404 has 135 divisors (see below), whose sum is σ = 481559319213. Its totient is φ = 85509208512.

The previous prime is 217251074297. The next prime is 217251074423. The reversal of 217251074404 is 404470152712.

The square root of 217251074404 is 466102.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 138317048100 + 78934026304 = 371910^2 + 280952^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1102797234 + ... + 1102797430.

Almost surely, 2^217251074404 is an apocalyptic number.

217251074404 is the 466102-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217251074404

217251074404 is an abundant number, since it is smaller than the sum of its proper divisors (264308244809).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217251074404 is an frugal number, since it uses more digits than its factorization.

217251074404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 37.

The spelling of 217251074404 in words is "two hundred seventeen billion, two hundred fifty-one million, seventy-four thousand, four hundred four".