21421213143 has 8 divisors (see below), whose sum is σ = 31158128256. Its totient is φ = 12982553400.

The previous prime is 21421213091. The next prime is 21421213213. The reversal of 21421213143 is 34131212412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21421213143 - 2²⁰ = 21420164567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421213243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324563803 + ... + 324563868.

It is an arithmetic number, because the mean of its divisors is an integer number (3894766032).

Almost surely, 2^21421213143 is an apocalyptic number.

21421213143 is a deficient number, since it is larger than the sum of its proper divisors (9736915113).

21421213143 is a wasteful number, since it uses less digits than its factorization.

21421213143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649127685.

The product of its digits is 1152, while the sum is 24.

Adding to 21421213143 its reverse (34131212412), we get a palindrome (55552425555).

The spelling of 21421213143 in words is "twenty-one billion, four hundred twenty-one million, two hundred thirteen thousand, one hundred forty-three".