21265133 has 8 divisors (see below), whose sum is σ = 22292928. Its totient is φ = 20245984.

The previous prime is 21265129. The next prime is 21265151. The reversal of 21265133 is 33156212.

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 21265133 - 2² = 21265129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21265099 and 21265108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265633) 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, 3185 + ... + 7257.

It is an arithmetic number, because the mean of its divisors is an integer number (2786616).

Almost surely, 2^21265133 is an apocalyptic number.

21265133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21265133 is a deficient number, since it is larger than the sum of its proper divisors (1027795).

21265133 is a wasteful number, since it uses less digits than its factorization.

21265133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323.

The product of its digits is 1080, while the sum is 23.

The square root of 21265133 is about 4611.4133408316. The cubic root of 21265133 is about 277.0486475485.

The spelling of 21265133 in words is "twenty-one million, two hundred sixty-five thousand, one hundred thirty-three".