21234142774 has 16 divisors (see below), whose sum is σ = 36319032288. Its totient is φ = 9223880832.

The previous prime is 21234142729. The next prime is 21234142789. The reversal of 21234142774 is 47724143212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24020082 + ... + 24020965.

It is an arithmetic number, because the mean of its divisors is an integer number (2269939518).

Almost surely, 2^21234142774 is an apocalyptic number.

21234142774 is a deficient number, since it is larger than the sum of its proper divisors (15084889514).

21234142774 is a wasteful number, since it uses less digits than its factorization.

21234142774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48041079.

The product of its digits is 75264, while the sum is 37.

Adding to 21234142774 its reverse (47724143212), we get a palindrome (68958285986).

The spelling of 21234142774 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty-two thousand, seven hundred seventy-four".