21379762 has 4 divisors (see below), whose sum is σ = 32069646. Its totient is φ = 10689880.

The previous prime is 21379759. The next prime is 21379763. The reversal of 21379762 is 26797312.

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

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 3308761 = 4251^2 + 1819^2 .

It is not an unprimeable number, because it can be changed into a prime (21379763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5344939 + ... + 5344942.

Almost surely, 2^21379762 is an apocalyptic number.

21379762 is a deficient number, since it is larger than the sum of its proper divisors (10689884).

21379762 is a wasteful number, since it uses less digits than its factorization.

21379762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10689883.

The product of its digits is 31752, while the sum is 37.

The square root of 21379762 is about 4623.8254724849. The cubic root of 21379762 is about 277.5455629539.

The spelling of 21379762 in words is "twenty-one million, three hundred seventy-nine thousand, seven hundred sixty-two".