21160142 has 4 divisors (see below), whose sum is σ = 31740216. Its totient is φ = 10580070.

The previous prime is 21160123. The next prime is 21160151. The reversal of 21160142 is 24106112.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21160142.

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 as a sum of consecutive naturals, namely, 5290034 + ... + 5290037.

It is an arithmetic number, because the mean of its divisors is an integer number (7935054).

Almost surely, 2^21160142 is an apocalyptic number.

21160142 is a deficient number, since it is larger than the sum of its proper divisors (10580074).

21160142 is a wasteful number, since it uses less digits than its factorization.

21160142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10580073.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21160142 is about 4600.0154347567. The cubic root of 21160142 is about 276.5919434983.

Adding to 21160142 its reverse (24106112), we get a palindrome (45266254).

The spelling of 21160142 in words is "twenty-one million, one hundred sixty thousand, one hundred forty-two".