21407343992 has 16 divisors (see below), whose sum is σ = 40215819600. Its totient is φ = 10683125440.

The previous prime is 21407343983. The next prime is 21407344019. The reversal of 21407343992 is 29934370412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2563892 + ... + 2572227.

It is an arithmetic number, because the mean of its divisors is an integer number (2513488725).

Almost surely, 2^21407343992 is an apocalyptic number.

It is an amenable number.

21407343992 is a deficient number, since it is larger than the sum of its proper divisors (18808475608).

21407343992 is a wasteful number, since it uses less digits than its factorization.

21407343992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5136646 (or 5136642 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 21407343992 in words is "twenty-one billion, four hundred seven million, three hundred forty-three thousand, nine hundred ninety-two".