21830797494 has 72 divisors (see below), whose sum is σ = 53668270656. Its totient is φ = 6401973600.

The previous prime is 21830797493. The next prime is 21830797529. The reversal of 21830797494 is 49479703812.

21830797494 is a `hidden beast` number, since 2 + 1 + 83 + 0 + 79 + 7 + 494 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21830797494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21830797493) 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 35 ways as a sum of consecutive naturals, for example, 94149 + ... + 229184.

It is an arithmetic number, because the mean of its divisors is an integer number (745392648).

Almost surely, 2^21830797494 is an apocalyptic number.

21830797494 is an abundant number, since it is smaller than the sum of its proper divisors (31837473162).

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

21830797494 is a wasteful number, since it uses less digits than its factorization.

21830797494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323394 (or 323380 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 21830797494 in words is "twenty-one billion, eight hundred thirty million, seven hundred ninety-seven thousand, four hundred ninety-four".