213143251421 has 8 divisors (see below), whose sum is σ = 213585336120. Its totient is φ = 212701404672.

The previous prime is 213143251417. The next prime is 213143251427. The reversal of 213143251421 is 124152341312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 88473528025 + 124669723396 = 297445^2 + 353086^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 213143251421 - 2² = 213143251417 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 (213143251427) 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, 1793381 + ... + 1908533.

It is an arithmetic number, because the mean of its divisors is an integer number (26698167015).

Almost surely, 2^213143251421 is an apocalyptic number.

It is an amenable number.

213143251421 is a deficient number, since it is larger than the sum of its proper divisors (442084699).

213143251421 is a wasteful number, since it uses less digits than its factorization.

213143251421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118975.

The product of its digits is 5760, while the sum is 29.

Adding to 213143251421 its reverse (124152341312), we get a palindrome (337295592733).

The spelling of 213143251421 in words is "two hundred thirteen billion, one hundred forty-three million, two hundred fifty-one thousand, four hundred twenty-one".