10221221021220 has 144 divisors (see below), whose sum is σ = 33826300522560. Its totient is φ = 2477626272000.

The previous prime is 10221221021203. The next prime is 10221221021243. The reversal of 10221221021220 is 2212012212201.

It is a happy number.

10221221021220 is a `hidden beast` number, since 1 + 0 + 2 + 212 + 210 + 21 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 10221221021193 and 10221221021202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20145411 + ... + 20646549.

It is an arithmetic number, because the mean of its divisors is an integer number (234904864740).

Almost surely, 2^{10221221021220} is an apocalyptic number.

10221221021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10221221021220 is an abundant number, since it is smaller than the sum of its proper divisors (23605079501340).

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

10221221021220 is a wasteful number, since it uses less digits than its factorization.

10221221021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511466 (or 511461 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 10221221021220 its reverse (2212012212201), we get a palindrome (12433233233421).

The spelling of 10221221021220 in words is "ten trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty".