1211020100101 has 4 divisors (see below), whose sum is σ = 1384022971552. Its totient is φ = 1038017228652.

The previous prime is 1211020100099. The next prime is 1211020100107. The reversal of 1211020100101 is 1010010201121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211020100101 - 2¹ = 1211020100099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211020100107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86501435715 + ... + 86501435728.

It is an arithmetic number, because the mean of its divisors is an integer number (346005742888).

Almost surely, 2^{1211020100101} is an apocalyptic number.

It is an amenable number.

1211020100101 is a deficient number, since it is larger than the sum of its proper divisors (173002871451).

1211020100101 is an equidigital number, since it uses as much as digits as its factorization.

1211020100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173002871450.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1211020100101 its reverse (1010010201121), we get a palindrome (2221030301222).

The spelling of 1211020100101 in words is "one trillion, two hundred eleven billion, twenty million, one hundred thousand, one hundred one".