21541293 has 12 divisors (see below), whose sum is σ = 31465980. Its totient is φ = 14198976.

The previous prime is 21541279. The next prime is 21541297. The reversal of 21541293 is 39214512.

It can be written as a sum of positive squares in 2 ways, for example, as 13264164 + 8277129 = 3642^2 + 2877^2 .

It is not a de Polignac number, because 21541293 - 2¹⁰ = 21540269 is a prime.

It is a super-2 number, since 2×21541293² = 928054608223698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541297) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12646 + ... + 14247.

It is an arithmetic number, because the mean of its divisors is an integer number (2622165).

Almost surely, 2^21541293 is an apocalyptic number.

It is an amenable number.

21541293 is a deficient number, since it is larger than the sum of its proper divisors (9924687).

21541293 is a wasteful number, since it uses less digits than its factorization.

21541293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26988 (or 26985 counting only the distinct ones).

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

The square root of 21541293 is about 4641.2598505147. The cubic root of 21541293 is about 278.2427920530.

The spelling of 21541293 in words is "twenty-one million, five hundred forty-one thousand, two hundred ninety-three".