21125829742 has 8 divisors (see below), whose sum is σ = 31722858000. Its totient is φ = 10551543744.

The previous prime is 21125829737. The next prime is 21125829821. The reversal of 21125829742 is 24792852112.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 5683242 + ... + 5686957.

It is an arithmetic number, because the mean of its divisors is an integer number (3965357250).

Almost surely, 2^21125829742 is an apocalyptic number.

21125829742 is a deficient number, since it is larger than the sum of its proper divisors (10597028258).

21125829742 is a wasteful number, since it uses less digits than its factorization.

21125829742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11371130.

The product of its digits is 161280, while the sum is 43.

The spelling of 21125829742 in words is "twenty-one billion, one hundred twenty-five million, eight hundred twenty-nine thousand, seven hundred forty-two".