1213122100 has 36 divisors (see below), whose sum is σ = 2671780384. Its totient is φ = 478003680.

The previous prime is 1213122077. The next prime is 1213122133. The reversal of 1213122100 is 12213121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83832 + ... + 97231.

Almost surely, 2^1213122100 is an apocalyptic number.

1213122100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213122100 is an abundant number, since it is smaller than the sum of its proper divisors (1458658284).

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

1213122100 is a wasteful number, since it uses less digits than its factorization.

1213122100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181144 (or 181137 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1213122100 is about 34829.9023828664. The cubic root of 1213122100 is about 1066.5179556137.

Adding to 1213122100 its reverse (12213121), we get a palindrome (1225335221).

The spelling of 1213122100 in words is "one billion, two hundred thirteen million, one hundred twenty-two thousand, one hundred".