21849720143 has 4 divisors (see below), whose sum is σ = 21852333720. Its totient is φ = 21847106568.

The previous prime is 21849720107. The next prime is 21849720157. The reversal of 21849720143 is 34102794812.

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

It is a cyclic number.

It is not a de Polignac number, because 21849720143 - 2⁸ = 21849719887 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 21849720143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849722143) 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, 1294208 + ... + 1310981.

It is an arithmetic number, because the mean of its divisors is an integer number (5463083430).

Almost surely, 2^21849720143 is an apocalyptic number.

21849720143 is a deficient number, since it is larger than the sum of its proper divisors (2613577).

21849720143 is an equidigital number, since it uses as much as digits as its factorization.

21849720143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613576.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 21849720143 in words is "twenty-one billion, eight hundred forty-nine million, seven hundred twenty thousand, one hundred forty-three".