21741994378 has 16 divisors (see below), whose sum is σ = 35128558080. Its totient is φ = 10032802416.

The previous prime is 21741994301. The next prime is 21741994409. The reversal of 21741994378 is 87349914712.

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, 58051 + ... + 216457.

It is an arithmetic number, because the mean of its divisors is an integer number (2195534880).

Almost surely, 2^21741994378 is an apocalyptic number.

21741994378 is a deficient number, since it is larger than the sum of its proper divisors (13386563702).

21741994378 is a wasteful number, since it uses less digits than its factorization.

21741994378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163701.

The product of its digits is 3048192, while the sum is 55.

The spelling of 21741994378 in words is "twenty-one billion, seven hundred forty-one million, nine hundred ninety-four thousand, three hundred seventy-eight".