21964255 has 8 divisors (see below), whose sum is σ = 27907632. Its totient is φ = 16537728.

The previous prime is 21964231. The next prime is 21964259. The reversal of 21964255 is 55246912.

It is a happy number.

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 21964255 - 2⁹ = 21963743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21964255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21964259) 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, 129117 + ... + 129286.

It is an arithmetic number, because the mean of its divisors is an integer number (3488454).

Almost surely, 2^21964255 is an apocalyptic number.

21964255 is a deficient number, since it is larger than the sum of its proper divisors (5943377).

21964255 is a wasteful number, since it uses less digits than its factorization.

21964255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258425.

The product of its digits is 21600, while the sum is 34.

The square root of 21964255 is about 4686.6037809911. The cubic root of 21964255 is about 280.0520948988.

The spelling of 21964255 in words is "twenty-one million, nine hundred sixty-four thousand, two hundred fifty-five".