919267975421 has 4 divisors (see below), whose sum is σ = 919595936832. Its totient is φ = 918940014012.

The previous prime is 919267975397. The next prime is 919267975441. The reversal of 919267975421 is 124579762919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 919267975421 - 2⁶ = 919267975357 is a prime.

It is a super-2 number, since 2×919267975421² (a number of 25 digits) 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 (919267975441) 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, 163976501 + ... + 163982106.

It is an arithmetic number, because the mean of its divisors is an integer number (229898984208).

Almost surely, 2^919267975421 is an apocalyptic number.

It is an amenable number.

919267975421 is a deficient number, since it is larger than the sum of its proper divisors (327961411).

919267975421 is a wasteful number, since it uses less digits than its factorization.

919267975421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327961410.

The product of its digits is 17146080, while the sum is 62.

The spelling of 919267975421 in words is "nine hundred nineteen billion, two hundred sixty-seven million, nine hundred seventy-five thousand, four hundred twenty-one".