21024942 has 16 divisors (see below), whose sum is σ = 43500240. Its totient is φ = 6766592.

The previous prime is 21024911. The next prime is 21024953. The reversal of 21024942 is 24942012.

It is a super-2 number, since 2×21024942² = 884096372206728, which contains 22 as substring.

It is a congruent number.

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, 60243 + ... + 60590.

It is an arithmetic number, because the mean of its divisors is an integer number (2718765).

Almost surely, 2^21024942 is an apocalyptic number.

21024942 is an abundant number, since it is smaller than the sum of its proper divisors (22475298).

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

21024942 is a wasteful number, since it uses less digits than its factorization.

21024942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120867.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21024942 is about 4585.2962826845. The cubic root of 21024942 is about 276.0016015450.

Adding to 21024942 its reverse (24942012), we get a palindrome (45966954).

It can be divided in two parts, 210 and 24942, that added together give a palindrome (25152).

The spelling of 21024942 in words is "twenty-one million, twenty-four thousand, nine hundred forty-two".