1220003300021 has 6 divisors (see below), whose sum is σ = 1340995362966. Its totient is φ = 1109093909000.

The previous prime is 1220003299979. The next prime is 1220003300027. The reversal of 1220003300021 is 1200033000221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1038689143921 + 181314156100 = 1019161^2 + 425810^2 .

It is not a de Polignac number, because 1220003300021 - 2³⁸ = 945125393077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220003299969 and 1220003300005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220003300027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5041335830 + ... + 5041336071.

It is an arithmetic number, because the mean of its divisors is an integer number (223499227161).

Almost surely, 2^{1220003300021} is an apocalyptic number.

1220003300021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220003300021 is a deficient number, since it is larger than the sum of its proper divisors (120992062945).

1220003300021 is a wasteful number, since it uses less digits than its factorization.

1220003300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10082671923 (or 10082671912 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 1220003300021 its reverse (1200033000221), we get a palindrome (2420036300242).

It can be divided in two parts, 1 and 220003300021, that added together give a palindrome (220003300022).

The spelling of 1220003300021 in words is "one trillion, two hundred twenty billion, three million, three hundred thousand, twenty-one".