1222210100 has 18 divisors (see below), whose sum is σ = 2652196134. Its totient is φ = 488884000.

The previous prime is 1222210097. The next prime is 1222210127. The reversal of 1222210100 is 10122221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 177369124 + 1044840976 = 13318^2 + 32324^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6110951 + ... + 6111150.

Almost surely, 2^1222210100 is an apocalyptic number.

1222210100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222210100 is an abundant number, since it is smaller than the sum of its proper divisors (1429986034).

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

1222210100 is a wasteful number, since it uses less digits than its factorization.

1222210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12222115 (or 12222108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1222210100 is about 34960.1215672944. The cubic root of 1222210100 is about 1069.1745752193.

Adding to 1222210100 its reverse (10122221), we get a palindrome (1232332321).

It can be divided in two parts, 12222 and 10100, that added together give a palindrome (22322).

The spelling of 1222210100 in words is "one billion, two hundred twenty-two million, two hundred ten thousand, one hundred".