2221121100020 has 24 divisors (see below), whose sum is σ = 4710536040168. Its totient is φ = 879651920000.

The previous prime is 2221121099993. The next prime is 2221121100041. The reversal of 2221121100020 is 200011211222.

It can be written as a sum of positive squares in 4 ways, for example, as 191054661604 + 2030066438416 = 437098^2 + 1424804^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2221121099968 and 2221121100004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549780431 + ... + 549784470.

It is an arithmetic number, because the mean of its divisors is an integer number (196272335007).

Almost surely, 2^{2221121100020} is an apocalyptic number.

2221121100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221121100020 is an abundant number, since it is smaller than the sum of its proper divisors (2489414940148).

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

2221121100020 is a wasteful number, since it uses less digits than its factorization.

2221121100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099565011 (or 1099565009 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2221121100020 its reverse (200011211222), we get a palindrome (2421132311242).

The spelling of 2221121100020 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred thousand, twenty".