1211200102100 has 36 divisors (see below), whose sum is σ = 2639584547964. Its totient is φ = 482400718080.

The previous prime is 1211200102037. The next prime is 1211200102103. The reversal of 1211200102100 is 12010021121.

It can be written as a sum of positive squares in 6 ways, for example, as 392562396304 + 818637705796 = 626548^2 + 904786^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211200102103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25968119 + ... + 26014718.

It is an arithmetic number, because the mean of its divisors is an integer number (73321792999).

Almost surely, 2^{1211200102100} is an apocalyptic number.

1211200102100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211200102100 is an abundant number, since it is smaller than the sum of its proper divisors (1428384445864).

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

1211200102100 is a wasteful number, since it uses less digits than its factorization.

1211200102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51983084 (or 51983077 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1211200102100 its reverse (12010021121), we get a palindrome (1223210123221).

The spelling of 1211200102100 in words is "one trillion, two hundred eleven billion, two hundred million, one hundred two thousand, one hundred".