21031042 has 8 divisors (see below), whose sum is σ = 32280336. Its totient is φ = 10270932.

The previous prime is 21031033. The next prime is 21031063. The reversal of 21031042 is 24013012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122188 + ... + 122359.

It is an arithmetic number, because the mean of its divisors is an integer number (4035042).

Almost surely, 2^21031042 is an apocalyptic number.

21031042 is a deficient number, since it is larger than the sum of its proper divisors (11249294).

21031042 is a wasteful number, since it uses less digits than its factorization.

21031042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244592.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21031042 is about 4585.9614041115. The cubic root of 21031042 is about 276.0282912258.

Adding to 21031042 its reverse (24013012), we get a palindrome (45044054).

The spelling of 21031042 in words is "twenty-one million, thirty-one thousand, forty-two".