617370021 has 12 divisors (see below), whose sum is σ = 938691520. Its totient is φ = 389917800.

The previous prime is 617369989. The next prime is 617370107. The reversal of 617370021 is 120073716.

It is not a de Polignac number, because 617370021 - 2⁵ = 617369989 is a prime.

It is a super-2 number, since 2×617370021² = 762291485659080882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617370421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1805005 + ... + 1805346.

Almost surely, 2^617370021 is an apocalyptic number.

It is an amenable number.

617370021 is a deficient number, since it is larger than the sum of its proper divisors (321321499).

617370021 is a wasteful number, since it uses less digits than its factorization.

617370021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610376 (or 3610373 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 617370021 is about 24846.9318226617. The cubic root of 617370021 is about 851.4944969702.

The spelling of 617370021 in words is "six hundred seventeen million, three hundred seventy thousand, twenty-one".