1201212021101 has 16 divisors (see below), whose sum is σ = 1284676556400. Its totient is φ = 1119194431488.

The previous prime is 1201212020977. The next prime is 1201212021179. The reversal of 1201212021101 is 1011202121021.

It can be written as a sum of positive squares in 8 ways, for example, as 55177540201 + 1146034480900 = 234899^2 + 1070530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201212021101 - 2¹⁰ = 1201212020077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212021301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1215365 + ... + 1969653.

It is an arithmetic number, because the mean of its divisors is an integer number (80292284775).

Almost surely, 2^{1201212021101} is an apocalyptic number.

It is an amenable number.

1201212021101 is a deficient number, since it is larger than the sum of its proper divisors (83464535299).

1201212021101 is a wasteful number, since it uses less digits than its factorization.

1201212021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755248.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1201212021101 its reverse (1011202121021), we get a palindrome (2212414142122).

The spelling of 1201212021101 in words is "one trillion, two hundred one billion, two hundred twelve million, twenty-one thousand, one hundred one".