21345250143 has 16 divisors (see below), whose sum is σ = 32694630656. Its totient is φ = 12134085120.

The previous prime is 21345250139. The next prime is 21345250163. The reversal of 21345250143 is 34105254312.

It is not a de Polignac number, because 21345250143 - 2² = 21345250139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21345250143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345250163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2629213 + ... + 2637318.

It is an arithmetic number, because the mean of its divisors is an integer number (2043414416).

Almost surely, 2^21345250143 is an apocalyptic number.

21345250143 is a deficient number, since it is larger than the sum of its proper divisors (11349380513).

21345250143 is a wasteful number, since it uses less digits than its factorization.

21345250143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266734.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21345250143 in words is "twenty-one billion, three hundred forty-five million, two hundred fifty thousand, one hundred forty-three".