10221220120020 has 288 divisors, whose sum is σ = 36053214825600. Its totient is φ = 2144515838976.

The previous prime is 10221220120019. The next prime is 10221220120043. The reversal of 10221220120020 is 2002102212201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6094366 + ... + 7588394.

It is an arithmetic number, because the mean of its divisors is an integer number (125184773700).

Almost surely, 2^{10221220120020} is an apocalyptic number.

10221220120020 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 10221220120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18026607412800).

10221220120020 is an abundant number, since it is smaller than the sum of its proper divisors (25831994705580).

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

10221220120020 is a wasteful number, since it uses less digits than its factorization.

10221220120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494247 (or 1494238 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 10221220120020 its reverse (2002102212201), we get a palindrome (12223322332221).

The spelling of 10221220120020 in words is "ten trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, twenty".