2121332220020 has 48 divisors (see below), whose sum is σ = 4807245518208. Its totient is φ = 781665843840.

The previous prime is 2121332220017. The next prime is 2121332220023. The reversal of 2121332220020 is 200222331212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121332220017) and next prime (2121332220023).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2121332219974 and 2121332220001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121332220023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8180864 + ... + 8436183.

It is an arithmetic number, because the mean of its divisors is an integer number (100150948296).

Almost surely, 2^{2121332220020} is an apocalyptic number.

2121332220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121332220020 is an abundant number, since it is smaller than the sum of its proper divisors (2685913298188).

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

2121332220020 is a wasteful number, since it uses less digits than its factorization.

2121332220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16617560 (or 16617558 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 2121332220020 its reverse (200222331212), we get a palindrome (2321554551232).

The spelling of 2121332220020 in words is "two trillion, one hundred twenty-one billion, three hundred thirty-two million, two hundred twenty thousand, twenty".