921899013 has 64 divisors (see below), whose sum is σ = 1480550400. Its totient is φ = 499449600.

The previous prime is 921898997. The next prime is 921899021. The reversal of 921899013 is 310998129.

It is not a de Polignac number, because 921899013 - 2⁴ = 921898997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921899093) 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 63 ways as a sum of consecutive naturals, for example, 6632298 + ... + 6632436.

It is an arithmetic number, because the mean of its divisors is an integer number (23133600).

Almost surely, 2^921899013 is an apocalyptic number.

It is an amenable number.

921899013 is a deficient number, since it is larger than the sum of its proper divisors (558651387).

921899013 is a wasteful number, since it uses less digits than its factorization.

921899013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 921899013 is about 30362.7899409787. The cubic root of 921899013 is about 973.2575542925.

The spelling of 921899013 in words is "nine hundred twenty-one million, eight hundred ninety-nine thousand, thirteen".