21093254 has 32 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 7980192.

The previous prime is 21093253. The next prime is 21093283. The reversal of 21093254 is 45239012.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1667 + ... + 6705.

It is an arithmetic number, because the mean of its divisors is an integer number (1270080).

Almost surely, 2^21093254 is an apocalyptic number.

21093254 is a deficient number, since it is larger than the sum of its proper divisors (19549306).

21093254 is a wasteful number, since it uses less digits than its factorization.

21093254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21093254 is about 4592.7392697605. The cubic root of 21093254 is about 276.3001967163.

It can be divided in two parts, 2109 and 3254, that multiplied together give a palindrome (6862686).

The spelling of 21093254 in words is "twenty-one million, ninety-three thousand, two hundred fifty-four".