101220111221 has 4 divisors (see below), whose sum is σ = 101948313600. Its totient is φ = 100491908844.

The previous prime is 101220111217. The next prime is 101220111233. The reversal of 101220111221 is 122111022101.

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 101220111221 - 2² = 101220111217 is a prime.

It is a super-2 number, since 2×101220111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220111196 and 101220111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220111521) 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, 364100981 + ... + 364101258.

It is an arithmetic number, because the mean of its divisors is an integer number (25487078400).

Almost surely, 2^101220111221 is an apocalyptic number.

It is an amenable number.

101220111221 is a deficient number, since it is larger than the sum of its proper divisors (728202379).

101220111221 is an equidigital number, since it uses as much as digits as its factorization.

101220111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728202378.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 101220111221 its reverse (122111022101), we get a palindrome (223331133322).

The spelling of 101220111221 in words is "one hundred one billion, two hundred twenty million, one hundred eleven thousand, two hundred twenty-one".