20002121111220 has 384 divisors, whose sum is σ = 61499063808000. Its totient is φ = 4838032281600.

The previous prime is 20002121111213. The next prime is 20002121111233. The reversal of 20002121111220 is 2211112120002.

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 20002121111220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3090081904 + ... + 3090088376.

It is an arithmetic number, because the mean of its divisors is an integer number (160153812000).

Almost surely, 2^{20002121111220} is an apocalyptic number.

20002121111220 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 20002121111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30749531904000).

20002121111220 is an abundant number, since it is smaller than the sum of its proper divisors (41496942696780).

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

20002121111220 is a wasteful number, since it uses less digits than its factorization.

20002121111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7303 (or 7301 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20002121111220 its reverse (2211112120002), we get a palindrome (22213233231222).

The spelling of 20002121111220 in words is "twenty trillion, two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty".