21047246 has 32 divisors (see below), whose sum is σ = 35544960. Its totient is φ = 9266400.

The previous prime is 21047237. The next prime is 21047281. The reversal of 21047246 is 64274012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160601 + ... + 160731.

It is an arithmetic number, because the mean of its divisors is an integer number (1110780).

Almost surely, 2^21047246 is an apocalyptic number.

21047246 is a deficient number, since it is larger than the sum of its proper divisors (14497714).

21047246 is a wasteful number, since it uses less digits than its factorization.

21047246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21047246 is about 4587.7277600137. The cubic root of 21047246 is about 276.0991644648.

The spelling of 21047246 in words is "twenty-one million, forty-seven thousand, two hundred forty-six".