21125246 has 4 divisors (see below), whose sum is σ = 31687872. Its totient is φ = 10562622.

The previous prime is 21125239. The next prime is 21125257. The reversal of 21125246 is 64252112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281310 + ... + 5281313.

It is an arithmetic number, because the mean of its divisors is an integer number (7921968).

Almost surely, 2^21125246 is an apocalyptic number.

21125246 is a deficient number, since it is larger than the sum of its proper divisors (10562626).

21125246 is a wasteful number, since it uses less digits than its factorization.

21125246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10562625.

The product of its digits is 960, while the sum is 23.

The square root of 21125246 is about 4596.2208389067. The cubic root of 21125246 is about 276.4398137201.

Adding to 21125246 its reverse (64252112), we get a palindrome (85377358).

The spelling of 21125246 in words is "twenty-one million, one hundred twenty-five thousand, two hundred forty-six".