1221030313020 has 144 divisors (see below), whose sum is σ = 4319291121600. Its totient is φ = 279092628864.

The previous prime is 1221030312989. The next prime is 1221030313033. The reversal of 1221030313020 is 203130301221.

1221030313020 is a `hidden beast` number, since 1 + 2 + 210 + 303 + 130 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221030312984 and 1221030313002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9826747 + ... + 9950226.

Almost surely, 2^{1221030313020} is an apocalyptic number.

1221030313020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221030313020 is an abundant number, since it is smaller than the sum of its proper divisors (3098260808580).

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

1221030313020 is a wasteful number, since it uses less digits than its factorization.

1221030313020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19777009 (or 19776990 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 1221030313020 its reverse (203130301221), we get a palindrome (1424160614241).

The spelling of 1221030313020 in words is "one trillion, two hundred twenty-one billion, thirty million, three hundred thirteen thousand, twenty".