101221001220 has 24 divisors (see below), whose sum is σ = 283418803584. Its totient is φ = 26992266976.

The previous prime is 101221001209. The next prime is 101221001303. The reversal of 101221001220 is 22100122101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 101221001196 and 101221001205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843508284 + ... + 843508403.

It is an arithmetic number, because the mean of its divisors is an integer number (11809116816).

Almost surely, 2^101221001220 is an apocalyptic number.

101221001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221001220 is an abundant number, since it is smaller than the sum of its proper divisors (182197802364).

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

101221001220 is a wasteful number, since it uses less digits than its factorization.

101221001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687016699 (or 1687016697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 101221001220 its reverse (22100122101), we get a palindrome (123321123321).

The spelling of 101221001220 in words is "one hundred one billion, two hundred twenty-one million, one thousand, two hundred twenty".