213124412421 has 12 divisors (see below), whose sum is σ = 307851043500. Its totient is φ = 142080786240.

The previous prime is 213124412399. The next prime is 213124412429. The reversal of 213124412421 is 124214421312.

213124412421 is a `hidden beast` number, since 213 + 1 + 2 + 441 + 2 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 125337240900 + 87787171521 = 354030^2 + 296289^2 .

It is not a de Polignac number, because 213124412421 - 2¹⁰ = 213124411397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213124412429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646705 + ... + 918953.

It is an arithmetic number, because the mean of its divisors is an integer number (25654253625).

Almost surely, 2^213124412421 is an apocalyptic number.

It is an amenable number.

213124412421 is a deficient number, since it is larger than the sum of its proper divisors (94726631079).

213124412421 is a wasteful number, since it uses less digits than its factorization.

213124412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359236 (or 359233 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 213124412421 its reverse (124214421312), we get a palindrome (337338833733).

The spelling of 213124412421 in words is "two hundred thirteen billion, one hundred twenty-four million, four hundred twelve thousand, four hundred twenty-one".