21142430111 has 4 divisors (see below), whose sum is σ = 23064469224. Its totient is φ = 19220391000.

The previous prime is 21142430083. The next prime is 21142430131. The reversal of 21142430111 is 11103424112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142430111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142430131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961019540 + ... + 961019561.

It is an arithmetic number, because the mean of its divisors is an integer number (5766117306).

Almost surely, 2^21142430111 is an apocalyptic number.

21142430111 is a deficient number, since it is larger than the sum of its proper divisors (1922039113).

21142430111 is a wasteful number, since it uses less digits than its factorization.

21142430111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922039112.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21142430111 its reverse (11103424112), we get a palindrome (32245854223).

The spelling of 21142430111 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty thousand, one hundred eleven".