21455133 has 8 divisors (see below), whose sum is σ = 32693568. Its totient is φ = 12260064.

The previous prime is 21455117. The next prime is 21455143. The reversal of 21455133 is 33155412.

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

It is not a de Polignac number, because 21455133 - 2⁴ = 21455117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455143) 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, 510816 + ... + 510857.

It is an arithmetic number, because the mean of its divisors is an integer number (4086696).

Almost surely, 2^21455133 is an apocalyptic number.

It is an amenable number.

21455133 is a deficient number, since it is larger than the sum of its proper divisors (11238435).

21455133 is a wasteful number, since it uses less digits than its factorization.

21455133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021683.

The product of its digits is 1800, while the sum is 24.

The square root of 21455133 is about 4631.9685879764. The cubic root of 21455133 is about 277.8713282356.

The spelling of 21455133 in words is "twenty-one million, four hundred fifty-five thousand, one hundred thirty-three".