1212223020100 has 81 divisors (see below), whose sum is σ = 2750441760157. Its totient is φ = 463710179680.

The previous prime is 1212223020079. The next prime is 1212223020119. The reversal of 1212223020100 is 10203222121.

It is a happy number.

The square root of 1212223020100 is 1101010.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 436400287236 + 775822732864 = 660606^2 + 880808^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 253229907 + ... + 253234693.

Almost surely, 2^{1212223020100} is an apocalyptic number.

1212223020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212223020100 is the 1101010-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212223020100

1212223020100 is an abundant number, since it is smaller than the sum of its proper divisors (1538218740057).

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

1212223020100 is an frugal number, since it uses more digits than its factorization.

1212223020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9634 (or 4817 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Multiplying 1212223020100 by its sum of digits (16), we get a square (19395568321600 = 4404040²).

Adding to 1212223020100 its reverse (10203222121), we get a palindrome (1222426242221).

The spelling of 1212223020100 in words is "one trillion, two hundred twelve billion, two hundred twenty-three million, twenty thousand, one hundred".