21722055 has 16 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 11558048.

The previous prime is 21722047. The next prime is 21722059. The reversal of 21722055 is 55022712.

It is a cyclic number.

It is not a de Polignac number, because 21722055 - 2³ = 21722047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6106 + ... + 8984.

It is an arithmetic number, because the mean of its divisors is an integer number (2177280).

Almost surely, 2^21722055 is an apocalyptic number.

21722055 is a deficient number, since it is larger than the sum of its proper divisors (13114425).

21722055 is a wasteful number, since it uses less digits than its factorization.

21722055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21722055 is about 4660.6925451053. The cubic root of 21722055 is about 279.0189090613.

Adding to 21722055 its reverse (55022712), we get a palindrome (76744767).

The spelling of 21722055 in words is "twenty-one million, seven hundred twenty-two thousand, fifty-five".