212131133221 has 8 divisors (see below), whose sum is σ = 246409935104. Its totient is φ = 178845919920.

The previous prime is 212131133219. The next prime is 212131133243. The reversal of 212131133221 is 122331131212.

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 212131133221 - 2¹ = 212131133219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212131133192 and 212131133201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212131133021) 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, 248396685 + ... + 248397538.

It is an arithmetic number, because the mean of its divisors is an integer number (30801241888).

Almost surely, 2^212131133221 is an apocalyptic number.

It is an amenable number.

212131133221 is a deficient number, since it is larger than the sum of its proper divisors (34278801883).

212131133221 is an equidigital number, since it uses as much as digits as its factorization.

212131133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496794291.

The product of its digits is 432, while the sum is 22.

Adding to 212131133221 its reverse (122331131212), we get a palindrome (334462264433).

The spelling of 212131133221 in words is "two hundred twelve billion, one hundred thirty-one million, one hundred thirty-three thousand, two hundred twenty-one".