2121210020020 has 144 divisors (see below), whose sum is σ = 5522747384448. Its totient is φ = 670096627200.

The previous prime is 2121210020003. The next prime is 2121210020021. The reversal of 2121210020020 is 200200121212.

It is a happy number.

It is a super-3 number, since 3×2121210020020³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121210020021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12860070 + ... + 13023970.

It is an arithmetic number, because the mean of its divisors is an integer number (38352412392).

Almost surely, 2^{2121210020020} is an apocalyptic number.

2121210020020 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 2121210020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2761373692224).

2121210020020 is an abundant number, since it is smaller than the sum of its proper divisors (3401537364428).

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

2121210020020 is a wasteful number, since it uses less digits than its factorization.

2121210020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164490 (or 164475 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2121210020020 its reverse (200200121212), we get a palindrome (2321410141232).

The spelling of 2121210020020 in words is "two trillion, one hundred twenty-one billion, two hundred ten million, twenty thousand, twenty".