21404722 has 8 divisors (see below), whose sum is σ = 32974956. Its totient is φ = 10413072.

The previous prime is 21404689. The next prime is 21404729. The reversal of 21404722 is 22740412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20061441 + 1343281 = 4479^2 + 1159^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21404693 and 21404702.

It is not an unprimeable number, because it can be changed into a prime (21404729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144553 + ... + 144700.

Almost surely, 2^21404722 is an apocalyptic number.

21404722 is a deficient number, since it is larger than the sum of its proper divisors (11570234).

21404722 is a wasteful number, since it uses less digits than its factorization.

21404722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289292.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 21404722 is about 4626.5237489934. The cubic root of 21404722 is about 277.6535286572.

The spelling of 21404722 in words is "twenty-one million, four hundred four thousand, seven hundred twenty-two".