21345250142 has 16 divisors (see below), whose sum is σ = 35168376960. Its totient is φ = 9671302872.

The previous prime is 21345250139. The next prime is 21345250163. The reversal of 21345250142 is 24105254312.

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, 12210368 + ... + 12212115.

It is an arithmetic number, because the mean of its divisors is an integer number (2198023560).

Almost surely, 2^21345250142 is an apocalyptic number.

21345250142 is a deficient number, since it is larger than the sum of its proper divisors (13823126818).

21345250142 is a wasteful number, since it uses less digits than its factorization.

21345250142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24422527.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21345250142 in words is "twenty-one billion, three hundred forty-five million, two hundred fifty thousand, one hundred forty-two".