21403940412 has 24 divisors (see below), whose sum is σ = 51292326736. Its totient is φ = 6941818368.

The previous prime is 21403940381. The next prime is 21403940429. The reversal of 21403940412 is 21404930412.

It is a self number, because there is not a number n which added to its sum of digits gives 21403940412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24103093 + ... + 24103980.

Almost surely, 2^21403940412 is an apocalyptic number.

It is an amenable number.

21403940412 is an abundant number, since it is smaller than the sum of its proper divisors (29888386324).

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

21403940412 is a wasteful number, since it uses less digits than its factorization.

21403940412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48207117 (or 48207115 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 21403940412 in words is "twenty-one billion, four hundred three million, nine hundred forty thousand, four hundred twelve".