21394139412 has 24 divisors (see below), whose sum is σ = 49925260000. Its totient is φ = 7130579616.

The previous prime is 21394139411. The next prime is 21394139423. The reversal of 21394139412 is 21493149312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21394139411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16839 + ... + 207537.

Almost surely, 2^21394139412 is an apocalyptic number.

It is an amenable number.

21394139412 is an abundant number, since it is smaller than the sum of its proper divisors (28531120588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21394139412 is a wasteful number, since it uses less digits than its factorization.

21394139412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200055 (or 200053 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The spelling of 21394139412 in words is "twenty-one billion, three hundred ninety-four million, one hundred thirty-nine thousand, four hundred twelve".