21745622 has 8 divisors (see below), whose sum is σ = 32765376. Its totient is φ = 10823832.

The previous prime is 21745613. The next prime is 21745627. The reversal of 21745622 is 22654712.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23933 + ... + 24824.

It is an arithmetic number, because the mean of its divisors is an integer number (4095672).

Almost surely, 2^21745622 is an apocalyptic number.

21745622 is a deficient number, since it is larger than the sum of its proper divisors (11019754).

21745622 is a wasteful number, since it uses less digits than its factorization.

21745622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48982.

The product of its digits is 6720, while the sum is 29.

The square root of 21745622 is about 4663.2201320547. The cubic root of 21745622 is about 279.1197783087.

The spelling of 21745622 in words is "twenty-one million, seven hundred forty-five thousand, six hundred twenty-two".