1213132100 has 18 divisors (see below), whose sum is σ = 2632496874. Its totient is φ = 485252800.

The previous prime is 1213132093. The next prime is 1213132111. The reversal of 1213132100 is 12313121.

It can be written as a sum of positive squares in 3 ways, for example, as 359557444 + 853574656 = 18962^2 + 29216^2 .

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, 6065561 + ... + 6065760.

Almost surely, 2^1213132100 is an apocalyptic number.

1213132100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213132100 is an abundant number, since it is smaller than the sum of its proper divisors (1419364774).

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

1213132100 is a wasteful number, since it uses less digits than its factorization.

1213132100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12131335 (or 12131328 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1213132100 is about 34830.0459373800. The cubic root of 1213132100 is about 1066.5208861102.

Adding to 1213132100 its reverse (12313121), we get a palindrome (1225445221).

The spelling of 1213132100 in words is "one billion, two hundred thirteen million, one hundred thirty-two thousand, one hundred".