21401399999 has 32 divisors (see below), whose sum is σ = 25289671680. Its totient is φ = 17733945600.

The previous prime is 21401399989. The next prime is 21401400023. The reversal of 21401399999 is 99999310412.

It is not a de Polignac number, because 21401399999 - 2⁴ = 21401399983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401399939) 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, 6565232 + ... + 6568490.

It is an arithmetic number, because the mean of its divisors is an integer number (790302240).

Almost surely, 2^21401399999 is an apocalyptic number.

21401399999 is a deficient number, since it is larger than the sum of its proper divisors (3888271681).

21401399999 is a wasteful number, since it uses less digits than its factorization.

21401399999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The spelling of 21401399999 in words is "twenty-one billion, four hundred one million, three hundred ninety-nine thousand, nine hundred ninety-nine".