221213001231 has 12 divisors (see below), whose sum is σ = 328165834152. Its totient is φ = 143489514096.

The previous prime is 221213001161. The next prime is 221213001253. The reversal of 221213001231 is 132100312122.

221213001231 is a `hidden beast` number, since 221 + 21 + 300 + 123 + 1 = 666.

It is not a de Polignac number, because 221213001231 - 2⁷ = 221213001103 is a prime.

It is a super-2 number, since 2×221213001231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221213001281) 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, 332151321 + ... + 332151986.

It is an arithmetic number, because the mean of its divisors is an integer number (27347152846).

Almost surely, 2^221213001231 is an apocalyptic number.

221213001231 is a deficient number, since it is larger than the sum of its proper divisors (106952832921).

221213001231 is a wasteful number, since it uses less digits than its factorization.

221213001231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664303350 (or 664303347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221213001231 its reverse (132100312122), we get a palindrome (353313313353).

The spelling of 221213001231 in words is "two hundred twenty-one billion, two hundred thirteen million, one thousand, two hundred thirty-one".