1211212230100 has 36 divisors (see below), whose sum is σ = 2628744339004. Its totient is φ = 484408615680.

The previous prime is 1211212229989. The next prime is 1211212230113. The reversal of 1211212230100 is 10322121121.

It can be written as a sum of positive squares in 6 ways, for example, as 10175967376 + 1201036262724 = 100876^2 + 1095918^2 .

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, 312969 + ... + 1587568.

Almost surely, 2^{1211212230100} is an apocalyptic number.

1211212230100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211212230100 is an abundant number, since it is smaller than the sum of its proper divisors (1417532108904).

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

1211212230100 is a wasteful number, since it uses less digits than its factorization.

1211212230100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906924 (or 1906917 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1211212230100 its reverse (10322121121), we get a palindrome (1221534351221).

The spelling of 1211212230100 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred thirty thousand, one hundred".