1221121130020 has 24 divisors (see below), whose sum is σ = 2797477498368. Its totient is φ = 444044047200.

The previous prime is 1221121129981. The next prime is 1221121130029. The reversal of 1221121130020 is 200311211221.

It is a super-2 number, since 2×1221121130020² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221121129976 and 1221121130003.

It is not an unprimeable number, because it can be changed into a prime (1221121130029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2775275076 + ... + 2775275515.

It is an arithmetic number, because the mean of its divisors is an integer number (116561562432).

Almost surely, 2^{1221121130020} is an apocalyptic number.

1221121130020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221121130020 is an abundant number, since it is smaller than the sum of its proper divisors (1576356368348).

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

1221121130020 is a wasteful number, since it uses less digits than its factorization.

1221121130020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550550611 (or 5550550609 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221121130020 its reverse (200311211221), we get a palindrome (1421432341241).

The spelling of 1221121130020 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred thirty thousand, twenty".