21454329999 has 8 divisors (see below), whose sum is σ = 28873117440. Its totient is φ = 14169214616.

The previous prime is 21454329989. The next prime is 21454330031. The reversal of 21454329999 is 99992345412.

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

It is a cyclic number.

It is not a de Polignac number, because 21454329999 - 2¹⁵ = 21454297231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454329989) 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, 33417639 + ... + 33418280.

It is an arithmetic number, because the mean of its divisors is an integer number (3609139680).

Almost surely, 2^21454329999 is an apocalyptic number.

21454329999 is a deficient number, since it is larger than the sum of its proper divisors (7418787441).

21454329999 is a wasteful number, since it uses less digits than its factorization.

21454329999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66836029.

The product of its digits is 6298560, while the sum is 57.

The spelling of 21454329999 in words is "twenty-one billion, four hundred fifty-four million, three hundred twenty-nine thousand, nine hundred ninety-nine".