101211222121211 has 4 divisors (see below), whose sum is σ = 101211326932872. Its totient is φ = 101211117309552.

The previous prime is 101211222121201. The next prime is 101211222121213. The reversal of 101211222121211 is 112121222112101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101211222121211 - 2¹⁸ = 101211221859067 is a prime.

It is a super-2 number, since 2×101211222121211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101211222121213) 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, 50943761 + ... + 52893186.

It is an arithmetic number, because the mean of its divisors is an integer number (25302831733218).

Almost surely, 2^{101211222121211} is an apocalyptic number.

101211222121211 is a deficient number, since it is larger than the sum of its proper divisors (104811661).

101211222121211 is an equidigital number, since it uses as much as digits as its factorization.

101211222121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104811660.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 101211222121211 its reverse (112121222112101), we get a palindrome (213332444233312).

The spelling of 101211222121211 in words is "one hundred one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".