1211100132121 has 6 divisors (see below), whose sum is σ = 1331209236266. Its totient is φ = 1101000120000.

The previous prime is 1211100132113. The next prime is 1211100132139. The reversal of 1211100132121 is 1212310011121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 883299225600 + 327800906521 = 939840^2 + 572539^2 .

It is not a de Polignac number, because 1211100132121 - 2³ = 1211100132113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211100132095 and 1211100132104.

It is not an unprimeable number, because it can be changed into a prime (1211100136121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5004545880 + ... + 5004546121.

Almost surely, 2^{1211100132121} is an apocalyptic number.

1211100132121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211100132121 is a deficient number, since it is larger than the sum of its proper divisors (120109104145).

1211100132121 is a wasteful number, since it uses less digits than its factorization.

1211100132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10009092023 (or 10009092012 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1211100132121 its reverse (1212310011121), we get a palindrome (2423410143242).

The spelling of 1211100132121 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred thirty-two thousand, one hundred twenty-one".