21354722 has 16 divisors (see below), whose sum is σ = 33298944. Its totient is φ = 10260000.

The previous prime is 21354721. The next prime is 21354797. The reversal of 21354722 is 22745312.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21354691 and 21354700.

It is not an unprimeable number, because it can be changed into a prime (21354721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8222 + ... + 10502.

It is an arithmetic number, because the mean of its divisors is an integer number (2081184).

Almost surely, 2^21354722 is an apocalyptic number.

21354722 is a deficient number, since it is larger than the sum of its proper divisors (11944222).

21354722 is a wasteful number, since it uses less digits than its factorization.

21354722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465.

The product of its digits is 3360, while the sum is 26.

The square root of 21354722 is about 4621.1169645444. The cubic root of 21354722 is about 277.4371667387.

The spelling of 21354722 in words is "twenty-one million, three hundred fifty-four thousand, seven hundred twenty-two".