21719762 has 4 divisors (see below), whose sum is σ = 32579646. Its totient is φ = 10859880.

The previous prime is 21719759. The next prime is 21719767. The reversal of 21719762 is 26791712.

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., 18653761 + 3066001 = 4319^2 + 1751^2 .

It is a super-2 number, since 2×21719762² = 943496122673288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21719767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5429939 + ... + 5429942.

Almost surely, 2^21719762 is an apocalyptic number.

21719762 is a deficient number, since it is larger than the sum of its proper divisors (10859884).

21719762 is a wasteful number, since it uses less digits than its factorization.

21719762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10859883.

The product of its digits is 10584, while the sum is 35.

The square root of 21719762 is about 4660.4465451285. The cubic root of 21719762 is about 279.0090908854.

The spelling of 21719762 in words is "twenty-one million, seven hundred nineteen thousand, seven hundred sixty-two".