21132042 has 8 divisors (see below), whose sum is σ = 42264096. Its totient is φ = 7044012.

The previous prime is 21132011. The next prime is 21132061. The reversal of 21132042 is 24023112.

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

21132042 is an admirable number.

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, 1760998 + ... + 1761009.

It is an arithmetic number, because the mean of its divisors is an integer number (5283012).

Almost surely, 2^21132042 is an apocalyptic number.

21132042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21132042 is a wasteful number, since it uses less digits than its factorization.

21132042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522012.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21132042 is about 4596.9600824893. The cubic root of 21132042 is about 276.4694541410.

Adding to 21132042 its reverse (24023112), we get a palindrome (45155154).

The spelling of 21132042 in words is "twenty-one million, one hundred thirty-two thousand, forty-two".