21400329999 has 16 divisors (see below), whose sum is σ = 29253268352. Its totient is φ = 13908410208.

The previous prime is 21400329991. The next prime is 21400330001. The reversal of 21400329999 is 99992300412.

It is not a de Polignac number, because 21400329999 - 2³ = 21400329991 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400329991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91132 + ... + 226065.

It is an arithmetic number, because the mean of its divisors is an integer number (1828329272).

Almost surely, 2^21400329999 is an apocalyptic number.

21400329999 is a deficient number, since it is larger than the sum of its proper divisors (7852938353).

21400329999 is a wasteful number, since it uses less digits than its factorization.

21400329999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317766.

The product of its (nonzero) digits is 314928, while the sum is 48.

The spelling of 21400329999 in words is "twenty-one billion, four hundred million, three hundred twenty-nine thousand, nine hundred ninety-nine".