21494255 has 8 divisors (see below), whose sum is σ = 26030400. Its totient is φ = 17037216.

The previous prime is 21494251. The next prime is 21494257. The reversal of 21494255 is 55249412.

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 21494255 - 2² = 21494251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494251) 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, 19175 + ... + 20264.

It is an arithmetic number, because the mean of its divisors is an integer number (3253800).

Almost surely, 2^21494255 is an apocalyptic number.

21494255 is a deficient number, since it is larger than the sum of its proper divisors (4536145).

21494255 is a wasteful number, since it uses less digits than its factorization.

21494255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39553.

The product of its digits is 14400, while the sum is 32.

The square root of 21494255 is about 4636.1897070763. The cubic root of 21494255 is about 278.0401189448.

The spelling of 21494255 in words is "twenty-one million, four hundred ninety-four thousand, two hundred fifty-five".