101011121221 has 4 divisors (see below), whose sum is σ = 101047315744. Its totient is φ = 100974926700.

The previous prime is 101011121209. The next prime is 101011121227. The reversal of 101011121221 is 122121110101.

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: 122121110101 = 41 ⋅2978563661.

It is a cyclic number.

It is not a de Polignac number, because 101011121221 - 2¹¹ = 101011119173 is a prime.

It is a super-2 number, since 2×101011121221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101011121227) 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, 18093075 + ... + 18098656.

It is an arithmetic number, because the mean of its divisors is an integer number (25261828936).

Almost surely, 2^101011121221 is an apocalyptic number.

It is an amenable number.

101011121221 is a deficient number, since it is larger than the sum of its proper divisors (36194523).

101011121221 is an equidigital number, since it uses as much as digits as its factorization.

101011121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36194522.

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

Adding to 101011121221 its reverse (122121110101), we get a palindrome (223132231322).

The spelling of 101011121221 in words is "one hundred one billion, eleven million, one hundred twenty-one thousand, two hundred twenty-one".