12221443100 has 36 divisors (see below), whose sum is σ = 27376039488. Its totient is φ = 4730880000.

The previous prime is 12221443081. The next prime is 12221443163. The reversal of 12221443100 is 134412221.

It is a super-2 number, since 2×12221443100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1968101 + ... + 1974300.

Almost surely, 2^12221443100 is an apocalyptic number.

12221443100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221443100 is an abundant number, since it is smaller than the sum of its proper divisors (15154596388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221443100 is a wasteful number, since it uses less digits than its factorization.

12221443100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3942446 (or 3942439 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12221443100 its reverse (134412221), we get a palindrome (12355855321).

The spelling of 12221443100 in words is "twelve billion, two hundred twenty-one million, four hundred forty-three thousand, one hundred".