21024142 has 8 divisors (see below), whose sum is σ = 31659696. Its totient is φ = 10470912.

The previous prime is 21024137. The next prime is 21024173. The reversal of 21024142 is 24142012.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19938 + ... + 20965.

It is an arithmetic number, because the mean of its divisors is an integer number (3957462).

Almost surely, 2^21024142 is an apocalyptic number.

21024142 is a deficient number, since it is larger than the sum of its proper divisors (10635554).

21024142 is a wasteful number, since it uses less digits than its factorization.

21024142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41162.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21024142 is about 4585.2090464885. The cubic root of 21024142 is about 275.9981008761.

Adding to 21024142 its reverse (24142012), we get a palindrome (45166154).

It can be divided in two parts, 2 and 1024142, that added together give a square (1024144 = 1012²).

The spelling of 21024142 in words is "twenty-one million, twenty-four thousand, one hundred forty-two".