21046142 has 16 divisors (see below), whose sum is σ = 34201440. Its totient is φ = 9655392.

The previous prime is 21046139. The next prime is 21046147. The reversal of 21046142 is 24164012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046147) 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, 2159 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (2137590).

Almost surely, 2^21046142 is an apocalyptic number.

21046142 is a deficient number, since it is larger than the sum of its proper divisors (13155298).

21046142 is a wasteful number, since it uses less digits than its factorization.

21046142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4867.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21046142 is about 4587.6074374340. The cubic root of 21046142 is about 276.0943369321.

The spelling of 21046142 in words is "twenty-one million, forty-six thousand, one hundred forty-two".