221223212413 has 12 divisors (see below), whose sum is σ = 257372659740. Its totient is φ = 189596780352.

The previous prime is 221223212401. The next prime is 221223212459. The reversal of 221223212413 is 314212322122.

It can be written as a sum of positive squares in 2 ways, for example, as 63243196324 + 157980016089 = 251482^2 + 397467^2 .

It is not a de Polignac number, because 221223212413 - 2¹³ = 221223204221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223212813) 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, 137095 + ... + 679147.

It is an arithmetic number, because the mean of its divisors is an integer number (21447721645).

Almost surely, 2^221223212413 is an apocalyptic number.

It is an amenable number.

221223212413 is a deficient number, since it is larger than the sum of its proper divisors (36149447327).

221223212413 is an equidigital number, since it uses as much as digits as its factorization.

221223212413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550396 (or 550389 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 221223212413 its reverse (314212322122), we get a palindrome (535435534535).

The spelling of 221223212413 in words is "two hundred twenty-one billion, two hundred twenty-three million, two hundred twelve thousand, four hundred thirteen".