101621221220 has 48 divisors (see below), whose sum is σ = 218459203200. Its totient is φ = 39694828800.

The previous prime is 101621221201. The next prime is 101621221253. The reversal of 101621221220 is 22122126101.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 101621221192 and 101621221201.

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, 106985 + ... + 463344.

It is an arithmetic number, because the mean of its divisors is an integer number (4551233400).

Almost surely, 2^101621221220 is an apocalyptic number.

101621221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101621221220 is an abundant number, since it is smaller than the sum of its proper divisors (116837981980).

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

101621221220 is a wasteful number, since it uses less digits than its factorization.

101621221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570548 (or 570546 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 101621221220 its reverse (22122126101), we get a palindrome (123743347321).

The spelling of 101621221220 in words is "one hundred one billion, six hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty".