21678092989 has 24 divisors (see below), whose sum is σ = 25381188000. Its totient is φ = 18460876896.

The previous prime is 21678092923. The next prime is 21678092999. The reversal of 21678092989 is 98929087612.

It is not a de Polignac number, because 21678092989 - 2¹⁷ = 21677961917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21678092999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6193762 + ... + 6197260.

It is an arithmetic number, because the mean of its divisors is an integer number (1057549500).

Almost surely, 2^21678092989 is an apocalyptic number.

It is an amenable number.

21678092989 is a deficient number, since it is larger than the sum of its proper divisors (3703095011).

21678092989 is a wasteful number, since it uses less digits than its factorization.

21678092989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4297 (or 4290 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 61.

The spelling of 21678092989 in words is "twenty-one billion, six hundred seventy-eight million, ninety-two thousand, nine hundred eighty-nine".