840322912421 has 4 divisors (see below), whose sum is σ = 840377526144. Its totient is φ = 840268298700.

The previous prime is 840322912417. The next prime is 840322912427. The reversal of 840322912421 is 124219223048.

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 840322912421 - 2² = 840322912417 is a prime.

It is a super-2 number, since 2×840322912421² (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 (840322912427) 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, 27283775 + ... + 27314556.

It is an arithmetic number, because the mean of its divisors is an integer number (210094381536).

Almost surely, 2^840322912421 is an apocalyptic number.

It is an amenable number.

840322912421 is a deficient number, since it is larger than the sum of its proper divisors (54613723).

840322912421 is a wasteful number, since it uses less digits than its factorization.

840322912421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54613722.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 840322912421 in words is "eight hundred forty billion, three hundred twenty-two million, nine hundred twelve thousand, four hundred twenty-one".