21402030143 has 4 divisors (see below), whose sum is σ = 23048340168. Its totient is φ = 19755720120.

The previous prime is 21402030119. The next prime is 21402030157. The reversal of 21402030143 is 34103020412.

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 21402030143 - 2²⁸ = 21133594687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402030113) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 823154993 + ... + 823155018.

It is an arithmetic number, because the mean of its divisors is an integer number (5762085042).

Almost surely, 2^21402030143 is an apocalyptic number.

21402030143 is a deficient number, since it is larger than the sum of its proper divisors (1646310025).

21402030143 is a wasteful number, since it uses less digits than its factorization.

21402030143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646310024.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21402030143 its reverse (34103020412), we get a palindrome (55505050555).

The spelling of 21402030143 in words is "twenty-one billion, four hundred two million, thirty thousand, one hundred forty-three".