21759046 has 4 divisors (see below), whose sum is σ = 32638572. Its totient is φ = 10879522.

The previous prime is 21759043. The next prime is 21759053. The reversal of 21759046 is 64095712.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21759041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5439760 + ... + 5439763.

It is an arithmetic number, because the mean of its divisors is an integer number (8159643).

Almost surely, 2^21759046 is an apocalyptic number.

21759046 is a deficient number, since it is larger than the sum of its proper divisors (10879526).

21759046 is a wasteful number, since it uses less digits than its factorization.

21759046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10879525.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21759046 is about 4664.6592587240. The cubic root of 21759046 is about 279.1772018697.

The spelling of 21759046 in words is "twenty-one million, seven hundred fifty-nine thousand, forty-six".