20010221202120 has 128 divisors (see below), whose sum is σ = 62014132224000. Its totient is φ = 5160011754240.

The previous prime is 20010221202079. The next prime is 20010221202121. The reversal of 20010221202120 is 2120212201002.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20010221202120.

It is not an unprimeable number, because it can be changed into a prime (20010221202121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2867601 + ... + 6945759.

It is an arithmetic number, because the mean of its divisors is an integer number (484485408000).

Almost surely, 2^{20010221202120} is an apocalyptic number.

20010221202120 is a gapful number since it is divisible by the number (20) 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 20010221202120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31007066112000).

20010221202120 is an abundant number, since it is smaller than the sum of its proper divisors (42003911021880).

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

20010221202120 is a wasteful number, since it uses less digits than its factorization.

20010221202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079523 (or 4079519 counting only the distinct ones).

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

Adding to 20010221202120 its reverse (2120212201002), we get a palindrome (22130433403122).

The spelling of 20010221202120 in words is "twenty trillion, ten billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty".