21760402 has 4 divisors (see below), whose sum is σ = 32640606. Its totient is φ = 10880200.

The previous prime is 21760399. The next prime is 21760489. The reversal of 21760402 is 20406712.

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., 13169641 + 8590761 = 3629^2 + 2931^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5440099 + ... + 5440102.

Almost surely, 2^21760402 is an apocalyptic number.

21760402 is a deficient number, since it is larger than the sum of its proper divisors (10880204).

21760402 is a wasteful number, since it uses less digits than its factorization.

21760402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10880203.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21760402 is about 4664.8046046967. The cubic root of 21760402 is about 279.1830010887.

The spelling of 21760402 in words is "twenty-one million, seven hundred sixty thousand, four hundred two".