21120542 has 8 divisors (see below), whose sum is σ = 31750056. Its totient is φ = 10537192.

The previous prime is 21120523. The next prime is 21120551. The reversal of 21120542 is 24502112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21120542.

It is a congruent 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, 10373 + ... + 12240.

It is an arithmetic number, because the mean of its divisors is an integer number (3968757).

Almost surely, 2^21120542 is an apocalyptic number.

21120542 is a deficient number, since it is larger than the sum of its proper divisors (10629514).

21120542 is a wasteful number, since it uses less digits than its factorization.

21120542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23082.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21120542 is about 4595.7090856581. The cubic root of 21120542 is about 276.4192937316.

Adding to 21120542 its reverse (24502112), we get a palindrome (45622654).

The spelling of 21120542 in words is "twenty-one million, one hundred twenty thousand, five hundred forty-two".