21210302143 has 4 divisors (see below), whose sum is σ = 21230875728. Its totient is φ = 21189728560.

The previous prime is 21210302119. The next prime is 21210302153. The reversal of 21210302143 is 34120301212.

It is a happy number.

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 21210302143 - 2⁵ = 21210302111 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 21210302143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210302153) 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, 10285246 + ... + 10287307.

It is an arithmetic number, because the mean of its divisors is an integer number (5307718932).

Almost surely, 2^21210302143 is an apocalyptic number.

21210302143 is a deficient number, since it is larger than the sum of its proper divisors (20573585).

21210302143 is a wasteful number, since it uses less digits than its factorization.

21210302143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20573584.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210302143 its reverse (34120301212), we get a palindrome (55330603355).

The spelling of 21210302143 in words is "twenty-one billion, two hundred ten million, three hundred two thousand, one hundred forty-three".