21253046 has 8 divisors (see below), whose sum is σ = 31903680. Its totient is φ = 10618488.

The previous prime is 21253033. The next prime is 21253093. The reversal of 21253046 is 64035212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155 + ... + 6521.

It is an arithmetic number, because the mean of its divisors is an integer number (3987960).

Almost surely, 2^21253046 is an apocalyptic number.

21253046 is a deficient number, since it is larger than the sum of its proper divisors (10650634).

21253046 is a wasteful number, since it uses less digits than its factorization.

21253046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8038.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21253046 is about 4610.1026018951. The cubic root of 21253046 is about 276.9961465576.

Adding to 21253046 its reverse (64035212), we get a palindrome (85288258).

The spelling of 21253046 in words is "twenty-one million, two hundred fifty-three thousand, forty-six".