11223251221 has 16 divisors (see below), whose sum is σ = 14073865344. Its totient is φ = 8712385344.

The previous prime is 11223251219. The next prime is 11223251243. The reversal of 11223251221 is 12215232211.

It is not a de Polignac number, because 11223251221 - 2¹ = 11223251219 is a prime.

It is a super-2 number, since 2×11223251221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11223251192 and 11223251201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11223251201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1158691 + ... + 1168336.

It is an arithmetic number, because the mean of its divisors is an integer number (879616584).

Almost surely, 2^11223251221 is an apocalyptic number.

It is an amenable number.

11223251221 is a deficient number, since it is larger than the sum of its proper divisors (2850614123).

11223251221 is a wasteful number, since it uses less digits than its factorization.

11223251221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327100.

The product of its digits is 480, while the sum is 22.

Adding to 11223251221 its reverse (12215232211), we get a palindrome (23438483432).

The spelling of 11223251221 in words is "eleven billion, two hundred twenty-three million, two hundred fifty-one thousand, two hundred twenty-one".