20101021220 has 48 divisors (see below), whose sum is σ = 48251790720. Its totient is φ = 6890444544.

The previous prime is 20101021211. The next prime is 20101021223. The reversal of 20101021220 is 2212010102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20101021223) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 949511 + ... + 970449.

It is an arithmetic number, because the mean of its divisors is an integer number (1005245640).

Almost surely, 2^20101021220 is an apocalyptic number.

20101021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101021220 is an abundant number, since it is smaller than the sum of its proper divisors (28150769500).

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

20101021220 is a wasteful number, since it uses less digits than its factorization.

20101021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27812 (or 27810 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20101021220 its reverse (2212010102), we get a palindrome (22313031322).

The spelling of 20101021220 in words is "twenty billion, one hundred one million, twenty-one thousand, two hundred twenty".