21375742 has 8 divisors (see below), whose sum is σ = 32589432. Its totient is φ = 10512600.

The previous prime is 21375721. The next prime is 21375743. The reversal of 21375742 is 24757312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87484 + ... + 87727.

It is an arithmetic number, because the mean of its divisors is an integer number (4073679).

Almost surely, 2^21375742 is an apocalyptic number.

21375742 is a deficient number, since it is larger than the sum of its proper divisors (11213690).

21375742 is a wasteful number, since it uses less digits than its factorization.

21375742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175274.

The product of its digits is 11760, while the sum is 31.

The square root of 21375742 is about 4623.3907470600. The cubic root of 21375742 is about 277.5281663913.

The spelling of 21375742 in words is "twenty-one million, three hundred seventy-five thousand, seven hundred forty-two".