21046442 has 16 divisors (see below), whose sum is σ = 33929280. Its totient is φ = 9755328.

The previous prime is 21046429. The next prime is 21046447. The reversal of 21046442 is 24464012.

It is not an unprimeable number, because it can be changed into a prime (21046447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2342 + ... + 6897.

It is an arithmetic number, because the mean of its divisors is an integer number (2120580).

Almost surely, 2^21046442 is an apocalyptic number.

21046442 is a deficient number, since it is larger than the sum of its proper divisors (12882838).

21046442 is a wasteful number, since it uses less digits than its factorization.

21046442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9325.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 21046442 is about 4587.6401340994. The cubic root of 21046442 is about 276.0956487783.

The spelling of 21046442 in words is "twenty-one million, forty-six thousand, four hundred forty-two".