101211011221 has 4 divisors (see below), whose sum is σ = 103564755712. Its totient is φ = 98857266732.

The previous prime is 101211011203. The next prime is 101211011243. The reversal of 101211011221 is 122110112101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122110112101 = 3853 ⋅31692217.

It is a cyclic number.

It is not a de Polignac number, because 101211011221 - 2⁹ = 101211010709 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 (101211011021) 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, 1176872181 + ... + 1176872266.

It is an arithmetic number, because the mean of its divisors is an integer number (25891188928).

Almost surely, 2^101211011221 is an apocalyptic number.

It is an amenable number.

101211011221 is a deficient number, since it is larger than the sum of its proper divisors (2353744491).

101211011221 is an equidigital number, since it uses as much as digits as its factorization.

101211011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353744490.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 101211011221 its reverse (122110112101), we get a palindrome (223321123322).

The spelling of 101211011221 in words is "one hundred one billion, two hundred eleven million, eleven thousand, two hundred twenty-one".