21250412 has 12 divisors (see below), whose sum is σ = 37307760. Its totient is φ = 10591056.

The previous prime is 21250399. The next prime is 21250429. The reversal of 21250412 is 21405212.

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, 7112 + ... + 9647.

It is an arithmetic number, because the mean of its divisors is an integer number (3108980).

Almost surely, 2^21250412 is an apocalyptic number.

It is an amenable number.

21250412 is a deficient number, since it is larger than the sum of its proper divisors (16057348).

21250412 is a wasteful number, since it uses less digits than its factorization.

21250412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080 (or 17078 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21250412 is about 4609.8169161042. The cubic root of 21250412 is about 276.9847028961.

Adding to 21250412 its reverse (21405212), we get a palindrome (42655624).

The spelling of 21250412 in words is "twenty-one million, two hundred fifty thousand, four hundred twelve".