21024042 has 16 divisors (see below), whose sum is σ = 45282720. Its totient is φ = 6468912.

The previous prime is 21023971. The next prime is 21024067. The reversal of 21024042 is 24042012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134692 + ... + 134847.

It is an arithmetic number, because the mean of its divisors is an integer number (2830170).

Almost surely, 2^21024042 is an apocalyptic number.

21024042 is an abundant number, since it is smaller than the sum of its proper divisors (24258678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21024042 is a wasteful number, since it uses less digits than its factorization.

21024042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269557.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 21024042 is about 4585.1981418473. The cubic root of 21024042 is about 275.9976632862.

Adding to 21024042 its reverse (24042012), we get a palindrome (45066054).

The spelling of 21024042 in words is "twenty-one million, twenty-four thousand, forty-two".