101211111111221 has 4 divisors (see below), whose sum is σ = 101211732784512. Its totient is φ = 101210489437932.

The previous prime is 101211111111211. The next prime is 101211111111259. The reversal of 101211111111221 is 122111111112101.

It is a happy number.

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 101211111111221 - 2²⁶ = 101211044002357 is a prime.

It is a super-2 number, since 2×101211111111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 101211111111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211111111211) 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, 310592375 + ... + 310918068.

It is an arithmetic number, because the mean of its divisors is an integer number (25302933196128).

Almost surely, 2^{101211111111221} is an apocalyptic number.

It is an amenable number.

101211111111221 is a deficient number, since it is larger than the sum of its proper divisors (621673291).

101211111111221 is an equidigital number, since it uses as much as digits as its factorization.

101211111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621673290.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 101211111111221 its reverse (122111111112101), we get a palindrome (223322222223322).

The spelling of 101211111111221 in words is "one hundred one trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".