921922021 has 8 divisors (see below), whose sum is σ = 955306880. Its totient is φ = 889080192.

The previous prime is 921922013. The next prime is 921922031. The reversal of 921922021 is 120229129.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 921922021 - 2³ = 921922013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921922031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132300 + ... + 139093.

It is an arithmetic number, because the mean of its divisors is an integer number (119413360).

Almost surely, 2^921922021 is an apocalyptic number.

It is an amenable number.

921922021 is a deficient number, since it is larger than the sum of its proper divisors (33384859).

921922021 is a wasteful number, since it uses less digits than its factorization.

921922021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271515.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 921922021 is about 30363.1688234282. The cubic root of 921922021 is about 973.2656508133.

The spelling of 921922021 in words is "nine hundred twenty-one million, nine hundred twenty-two thousand, twenty-one".