21693439612 has 36 divisors (see below), whose sum is σ = 41354799696. Its totient is φ = 9952350720.

The previous prime is 21693439609. The next prime is 21693439637.

21693439612 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16812 + ... + 208972.

It is an arithmetic number, because the mean of its divisors is an integer number (1148744436).

Almost surely, 2^21693439612 is an apocalyptic number.

It is an amenable number.

21693439612 is a deficient number, since it is larger than the sum of its proper divisors (19661360084).

21693439612 is a wasteful number, since it uses less digits than its factorization.

21693439612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192358 (or 192343 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The spelling of 21693439612 in words is "twenty-one billion, six hundred ninety-three million, four hundred thirty-nine thousand, six hundred twelve".