921557104 has 20 divisors (see below), whose sum is σ = 1922864776. Its totient is φ = 425333952.

The previous prime is 921557023. The next prime is 921557107. The reversal of 921557104 is 401755129.

It is a self number, because there is not a number n which added to its sum of digits gives 921557104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921557107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2215074 + ... + 2215489.

Almost surely, 2^921557104 is an apocalyptic number.

It is an amenable number.

921557104 is an abundant number, since it is smaller than the sum of its proper divisors (1001307672).

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

921557104 is a wasteful number, since it uses less digits than its factorization.

921557104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4430584 (or 4430578 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 921557104 is about 30357.1590238612. The cubic root of 921557104 is about 973.1372205542.

The spelling of 921557104 in words is "nine hundred twenty-one million, five hundred fifty-seven thousand, one hundred four".