21046246 has 24 divisors (see below), whose sum is σ = 34705584. Its totient is φ = 9565920.

The previous prime is 21046231. The next prime is 21046253. The reversal of 21046246 is 64264012.

It is a self number, because there is not a number n which added to its sum of digits gives 21046246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23560 + ... + 24436.

It is an arithmetic number, because the mean of its divisors is an integer number (1446066).

Almost surely, 2^21046246 is an apocalyptic number.

21046246 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21046246 is a deficient number, since it is larger than the sum of its proper divisors (13659338).

21046246 is a wasteful number, since it uses less digits than its factorization.

21046246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21046246 is about 4587.6187723044. The cubic root of 21046246 is about 276.0947917068.

The spelling of 21046246 in words is "twenty-one million, forty-six thousand, two hundred forty-six".