21246746 has 16 divisors (see below), whose sum is σ = 32651424. Its totient is φ = 10365264.

The previous prime is 21246721. The next prime is 21246751. The reversal of 21246746 is 64764212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23621 + ... + 24503.

It is an arithmetic number, because the mean of its divisors is an integer number (2040714).

Almost surely, 2^21246746 is an apocalyptic number.

21246746 is a deficient number, since it is larger than the sum of its proper divisors (11404678).

21246746 is a wasteful number, since it uses less digits than its factorization.

21246746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165.

The product of its digits is 16128, while the sum is 32.

The square root of 21246746 is about 4609.4192692789. The cubic root of 21246746 is about 276.9687740392.

The spelling of 21246746 in words is "twenty-one million, two hundred forty-six thousand, seven hundred forty-six".