101221111220 has 48 divisors (see below), whose sum is σ = 215369497728. Its totient is φ = 39956745600.

The previous prime is 101221111213. The next prime is 101221111237. The reversal of 101221111220 is 22111122101.

It is a super-2 number, since 2×101221111220² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 101221111195 and 101221111204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538529 + ... + 701751.

It is an arithmetic number, because the mean of its divisors is an integer number (4486864536).

Almost surely, 2^101221111220 is an apocalyptic number.

101221111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221111220 is an abundant number, since it is smaller than the sum of its proper divisors (114148386508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101221111220 is a wasteful number, since it uses less digits than its factorization.

101221111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163640 (or 163638 counting only the distinct ones).

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

Adding to 101221111220 its reverse (22111122101), we get a palindrome (123332233321).

The spelling of 101221111220 in words is "one hundred one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty".