1221331230020 has 24 divisors (see below), whose sum is σ = 2797958818368. Its totient is φ = 444120447200.

The previous prime is 1221331230017. The next prime is 1221331230047. The reversal of 1221331230020 is 200321331221.

It is a super-2 number, since 2×1221331230020² (a number of 25 digits) contains 22 as substring.

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 = 1221331229974 and 1221331230001.

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, 2775752576 + ... + 2775753015.

It is an arithmetic number, because the mean of its divisors is an integer number (116581617432).

Almost surely, 2^{1221331230020} is an apocalyptic number.

1221331230020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221331230020 is an abundant number, since it is smaller than the sum of its proper divisors (1576627588348).

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

1221331230020 is a wasteful number, since it uses less digits than its factorization.

1221331230020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5551505611 (or 5551505609 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1221331230020 its reverse (200321331221), we get a palindrome (1421652561241).

The spelling of 1221331230020 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred thirty thousand, twenty".