21125377342 has 4 divisors (see below), whose sum is σ = 31688066016. Its totient is φ = 10562688670.

The previous prime is 21125377327. The next prime is 21125377367. The reversal of 21125377342 is 24377352112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281344334 + ... + 5281344337.

It is an arithmetic number, because the mean of its divisors is an integer number (7922016504).

Almost surely, 2^21125377342 is an apocalyptic number.

21125377342 is a deficient number, since it is larger than the sum of its proper divisors (10562688674).

21125377342 is a wasteful number, since it uses less digits than its factorization.

21125377342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10562688673.

The product of its digits is 70560, while the sum is 37.

The spelling of 21125377342 in words is "twenty-one billion, one hundred twenty-five million, three hundred seventy-seven thousand, three hundred forty-two".