21253862 has 8 divisors (see below), whose sum is σ = 36435216. Its totient is φ = 9108792.

The previous prime is 21253861. The next prime is 21253871. The reversal of 21253862 is 26835212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759053 + ... + 759080.

It is an arithmetic number, because the mean of its divisors is an integer number (4554402).

Almost surely, 2^21253862 is an apocalyptic number.

21253862 is a deficient number, since it is larger than the sum of its proper divisors (15181354).

21253862 is a wasteful number, since it uses less digits than its factorization.

21253862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518142.

The product of its digits is 5760, while the sum is 29.

The square root of 21253862 is about 4610.1911023297. The cubic root of 21253862 is about 276.9996915548. Note that the first 3 decimals are identical.

The spelling of 21253862 in words is "twenty-one million, two hundred fifty-three thousand, eight hundred sixty-two".