21392199412 has 24 divisors (see below), whose sum is σ = 38150331912. Its totient is φ = 10492185600.

The previous prime is 21392199397. The next prime is 21392199457. The reversal of 21392199412 is 21499129312.

It can be written as a sum of positive squares in 4 ways, for example, as 5630401296 + 15761798116 = 75036^2 + 125546^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1911112 + ... + 1922272.

It is an arithmetic number, because the mean of its divisors is an integer number (1589597163).

Almost surely, 2^21392199412 is an apocalyptic number.

It is an amenable number.

21392199412 is a deficient number, since it is larger than the sum of its proper divisors (16758132500).

21392199412 is a wasteful number, since it uses less digits than its factorization.

21392199412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20259 (or 20257 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The spelling of 21392199412 in words is "twenty-one billion, three hundred ninety-two million, one hundred ninety-nine thousand, four hundred twelve".