21722735 has 8 divisors (see below), whose sum is σ = 26114400. Its totient is φ = 17346784.

The previous prime is 21722717. The next prime is 21722747. The reversal of 21722735 is 53722712.

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

It is a cyclic number.

It is not a de Polignac number, because 21722735 - 2⁶ = 21722671 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21722698 and 21722707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (3264300).

Almost surely, 2^21722735 is an apocalyptic number.

21722735 is a deficient number, since it is larger than the sum of its proper divisors (4391665).

21722735 is an equidigital number, since it uses as much as digits as its factorization.

21722735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7857.

The product of its digits is 5880, while the sum is 29.

The square root of 21722735 is about 4660.7654950662. The cubic root of 21722735 is about 279.0218205550.

The spelling of 21722735 in words is "twenty-one million, seven hundred twenty-two thousand, seven hundred thirty-five".