21035378692 has 12 divisors (see below), whose sum is σ = 37361344720. Its totient is φ = 10360708776.

The previous prime is 21035378687. The next prime is 21035378701. The reversal of 21035378692 is 29687353012.

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, 39244842 + ... + 39245377.

Almost surely, 2^21035378692 is an apocalyptic number.

It is an amenable number.

21035378692 is a deficient number, since it is larger than the sum of its proper divisors (16325966028).

21035378692 is a wasteful number, since it uses less digits than its factorization.

21035378692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78490290 (or 78490288 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 21035378692 in words is "twenty-one billion, thirty-five million, three hundred seventy-eight thousand, six hundred ninety-two".