21394470099 has 16 divisors (see below), whose sum is σ = 28572998400. Its totient is φ = 14239485216.

The previous prime is 21394470067. The next prime is 21394470113. The reversal of 21394470099 is 99007449312.

It is a happy number.

It is not a de Polignac number, because 21394470099 - 2⁵ = 21394470067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21394470049) 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, 8032642 + ... + 8035304.

It is an arithmetic number, because the mean of its divisors is an integer number (1785812400).

Almost surely, 2^21394470099 is an apocalyptic number.

21394470099 is a deficient number, since it is larger than the sum of its proper divisors (7178528301).

21394470099 is a wasteful number, since it uses less digits than its factorization.

21394470099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074.

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 21394470099 in words is "twenty-one billion, three hundred ninety-four million, four hundred seventy thousand, ninety-nine".