21321798942 has 8 divisors (see below), whose sum is σ = 42643597896. Its totient is φ = 7107266312.

The previous prime is 21321798937. The next prime is 21321798983. The reversal of 21321798942 is 24989712312.

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

21321798942 is an admirable number.

It is a super-2 number, since 2×21321798942² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321798891 and 21321798900.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1776816573 + ... + 1776816584.

It is an arithmetic number, because the mean of its divisors is an integer number (5330449737).

Almost surely, 2^21321798942 is an apocalyptic number.

21321798942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21321798942 is a wasteful number, since it uses less digits than its factorization.

21321798942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553633162.

The product of its digits is 435456, while the sum is 48.

The spelling of 21321798942 in words is "twenty-one billion, three hundred twenty-one million, seven hundred ninety-eight thousand, nine hundred forty-two".