121211434100 has 18 divisors (see below), whose sum is σ = 263028812214. Its totient is φ = 48484573600.

The previous prime is 121211434039. The next prime is 121211434111. The reversal of 121211434100 is 1434112121.

It can be written as a sum of positive squares in 3 ways, for example, as 1603361764 + 119608072336 = 40042^2 + 345844^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 606057071 + ... + 606057270.

Almost surely, 2^121211434100 is an apocalyptic number.

121211434100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211434100 is an abundant number, since it is smaller than the sum of its proper divisors (141817378114).

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

121211434100 is a wasteful number, since it uses less digits than its factorization.

121211434100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212114355 (or 1212114348 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 121211434100 its reverse (1434112121), we get a palindrome (122645546221).

The spelling of 121211434100 in words is "one hundred twenty-one billion, two hundred eleven million, four hundred thirty-four thousand, one hundred".