121212102100 has 36 divisors (see below), whose sum is σ = 265741935004. Its totient is φ = 47984993280.

The previous prime is 121212102049. The next prime is 121212102113. The reversal of 121212102100 is 1201212121.

It can be written as a sum of positive squares in 6 ways, for example, as 366875716 + 120845226384 = 19154^2 + 347628^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6238347 + ... + 6257746.

Almost surely, 2^121212102100 is an apocalyptic number.

121212102100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212102100 is an abundant number, since it is smaller than the sum of its proper divisors (144529832904).

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

121212102100 is a wasteful number, since it uses less digits than its factorization.

121212102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12496204 (or 12496197 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121212102100 its reverse (1201212121), we get a palindrome (122413314221).

The spelling of 121212102100 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred two thousand, one hundred".