20111223213 has 8 divisors (see below), whose sum is σ = 29794404800. Its totient is φ = 13407482124.

The previous prime is 20111223211. The next prime is 20111223217. The reversal of 20111223213 is 31232211102.

It is not a de Polignac number, because 20111223213 - 2¹ = 20111223211 is a prime.

It is a super-2 number, since 2×20111223213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111223211) 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, 372430033 + ... + 372430086.

It is an arithmetic number, because the mean of its divisors is an integer number (3724300600).

Almost surely, 2^20111223213 is an apocalyptic number.

It is an amenable number.

20111223213 is a deficient number, since it is larger than the sum of its proper divisors (9683181587).

20111223213 is an equidigital number, since it uses as much as digits as its factorization.

20111223213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744860128 (or 744860122 counting only the distinct ones).

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

Adding to 20111223213 its reverse (31232211102), we get a palindrome (51343434315).

The spelling of 20111223213 in words is "twenty billion, one hundred eleven million, two hundred twenty-three thousand, two hundred thirteen".