21145293 has 40 divisors (see below), whose sum is σ = 34882848. Its totient is φ = 12682656.

The previous prime is 21145261. The next prime is 21145301. The reversal of 21145293 is 39254112.

It is not a de Polignac number, because 21145293 - 2⁵ = 21145261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145213) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 45046 + ... + 45512.

Almost surely, 2^21145293 is an apocalyptic number.

It is an amenable number.

21145293 is a deficient number, since it is larger than the sum of its proper divisors (13737555).

21145293 is a wasteful number, since it uses less digits than its factorization.

21145293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 526 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21145293 is about 4598.4011351773. The cubic root of 21145293 is about 276.5272294578.

The spelling of 21145293 in words is "twenty-one million, one hundred forty-five thousand, two hundred ninety-three".