20101111221 has 8 divisors (see below), whose sum is σ = 26810612640. Its totient is φ = 13396175312.

The previous prime is 20101111213. The next prime is 20101111223. The reversal of 20101111221 is 12211110102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20101111221 - 2³ = 20101111213 is a prime.

It is a super-2 number, since 2×20101111221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20101111197 and 20101111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101111223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1131090 + ... + 1148723.

It is an arithmetic number, because the mean of its divisors is an integer number (3351326580).

Almost surely, 2^20101111221 is an apocalyptic number.

It is an amenable number.

20101111221 is a deficient number, since it is larger than the sum of its proper divisors (6709501419).

20101111221 is a wasteful number, since it uses less digits than its factorization.

20101111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282755.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20101111221 its reverse (12211110102), we get a palindrome (32312221323).

The spelling of 20101111221 in words is "twenty billion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".