101222121220 has 96 divisors (see below), whose sum is σ = 235028739456. Its totient is φ = 36312576000.

The previous prime is 101222121211. The next prime is 101222121233. The reversal of 101222121220 is 22121222101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 101222121194 and 101222121203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6280212 + ... + 6296308.

It is an arithmetic number, because the mean of its divisors is an integer number (2448216036).

Almost surely, 2^101222121220 is an apocalyptic number.

101222121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101222121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117514369728).

101222121220 is an abundant number, since it is smaller than the sum of its proper divisors (133806618236).

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

101222121220 is a wasteful number, since it uses less digits than its factorization.

101222121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16501 (or 16499 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 101222121220 its reverse (22121222101), we get a palindrome (123343343321).

The spelling of 101222121220 in words is "one hundred one billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".