21299241864 has 128 divisors (see below), whose sum is σ = 57496521600. Its totient is φ = 6561085440.

The previous prime is 21299241833. The next prime is 21299241869. The reversal of 21299241864 is 46814299212.

It is not an unprimeable number, because it can be changed into a prime (21299241869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1505367 + ... + 1519449.

It is an arithmetic number, because the mean of its divisors is an integer number (449191575).

Almost surely, 2^21299241864 is an apocalyptic number.

21299241864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21299241864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28748260800).

21299241864 is an abundant number, since it is smaller than the sum of its proper divisors (36197279736).

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

21299241864 is a wasteful number, since it uses less digits than its factorization.

21299241864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14215 (or 14211 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The spelling of 21299241864 in words is "twenty-one billion, two hundred ninety-nine million, two hundred forty-one thousand, eight hundred sixty-four".