21481368999 has 8 divisors (see below), whose sum is σ = 28807385712. Its totient is φ = 14238132480.

The previous prime is 21481368959. The next prime is 21481369001. The reversal of 21481368999 is 99986318412.

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

It is not a de Polignac number, because 21481368999 - 2²⁷ = 21347151271 is a prime.

It is a super-2 number, since 2×21481368999² (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 (21481368919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20694442 + ... + 20695479.

It is an arithmetic number, because the mean of its divisors is an integer number (3600923214).

Almost surely, 2^21481368999 is an apocalyptic number.

21481368999 is a deficient number, since it is larger than the sum of its proper divisors (7326016713).

21481368999 is a wasteful number, since it uses less digits than its factorization.

21481368999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41390097.

The product of its digits is 6718464, while the sum is 60.

The spelling of 21481368999 in words is "twenty-one billion, four hundred eighty-one million, three hundred sixty-eight thousand, nine hundred ninety-nine".