21998974893 has 32 divisors (see below), whose sum is σ = 34469470464. Its totient is φ = 12216448512.

The previous prime is 21998974891. The next prime is 21998974931. The reversal of 21998974893 is 39847989912.

It is not a de Polignac number, because 21998974893 - 2¹ = 21998974891 is a prime.

It is a super-2 number, since 2×21998974893² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21998974891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 649371 + ... + 682407.

It is an arithmetic number, because the mean of its divisors is an integer number (1077170952).

Almost surely, 2^21998974893 is an apocalyptic number.

It is an amenable number.

21998974893 is a deficient number, since it is larger than the sum of its proper divisors (12470495571).

21998974893 is a wasteful number, since it uses less digits than its factorization.

21998974893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33941.

The product of its digits is 70543872, while the sum is 69.

The spelling of 21998974893 in words is "twenty-one billion, nine hundred ninety-eight million, nine hundred seventy-four thousand, eight hundred ninety-three".