21142445434 has 48 divisors (see below), whose sum is σ = 38289061440. Its totient is φ = 8708515200.

The previous prime is 21142445371. The next prime is 21142445449. The reversal of 21142445434 is 43454424112.

It is a self number, because there is not a number n which added to its sum of digits gives 21142445434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5794 + ... + 205714.

It is an arithmetic number, because the mean of its divisors is an integer number (797688780).

Almost surely, 2^21142445434 is an apocalyptic number.

21142445434 is a deficient number, since it is larger than the sum of its proper divisors (17146616006).

21142445434 is a wasteful number, since it uses less digits than its factorization.

21142445434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199987 (or 199976 counting only the distinct ones).

The product of its digits is 61440, while the sum is 34.

Adding to 21142445434 its reverse (43454424112), we get a palindrome (64596869546).

The spelling of 21142445434 in words is "twenty-one billion, one hundred forty-two million, four hundred forty-five thousand, four hundred thirty-four".