1222723100 has 18 divisors (see below), whose sum is σ = 2653309344. Its totient is φ = 489089200.

The previous prime is 1222723097. The next prime is 1222723109. The reversal of 1222723100 is 13272221.

It is a super-2 number, since 2×1222723100² = 2990103558547220000, which 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 not an unprimeable number, because it can be changed into a prime (1222723109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6113516 + ... + 6113715.

Almost surely, 2^1222723100 is an apocalyptic number.

1222723100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222723100 is an abundant number, since it is smaller than the sum of its proper divisors (1430586244).

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

1222723100 is a wasteful number, since it uses less digits than its factorization.

1222723100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12227245 (or 12227238 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1222723100 is about 34967.4577285796. The cubic root of 1222723100 is about 1069.3241430216.

Adding to 1222723100 its reverse (13272221), we get a palindrome (1235995321).

The spelling of 1222723100 in words is "one billion, two hundred twenty-two million, seven hundred twenty-three thousand, one hundred".