213221121231 has 8 divisors (see below), whose sum is σ = 289113384960. Its totient is φ = 139738135832.

The previous prime is 213221121199. The next prime is 213221121241. The reversal of 213221121231 is 132121122312.

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 213221121231 - 2⁵ = 213221121199 is a prime.

It is a super-2 number, since 2×213221121231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213221121198 and 213221121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221121241) 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, 602319375 + ... + 602319728.

It is an arithmetic number, because the mean of its divisors is an integer number (36139173120).

Almost surely, 2^213221121231 is an apocalyptic number.

213221121231 is a deficient number, since it is larger than the sum of its proper divisors (75892263729).

213221121231 is a wasteful number, since it uses less digits than its factorization.

213221121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204639165.

The product of its digits is 288, while the sum is 21.

Adding to 213221121231 its reverse (132121122312), we get a palindrome (345342243543).

The spelling of 213221121231 in words is "two hundred thirteen billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-one".