1220311030021 has 4 divisors (see below), whose sum is σ = 1238524627552. Its totient is φ = 1202097432492.

The previous prime is 1220311030007. The next prime is 1220311030027. The reversal of 1220311030021 is 1200301130221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220311030021 - 2⁷ = 1220311029893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220311029977 and 1220311030004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220311030027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9106798665 + ... + 9106798798.

It is an arithmetic number, because the mean of its divisors is an integer number (309631156888).

Almost surely, 2^{1220311030021} is an apocalyptic number.

It is an amenable number.

1220311030021 is a deficient number, since it is larger than the sum of its proper divisors (18213597531).

1220311030021 is an equidigital number, since it uses as much as digits as its factorization.

1220311030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18213597530.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1220311030021 its reverse (1200301130221), we get a palindrome (2420612160242).

The spelling of 1220311030021 in words is "one trillion, two hundred twenty billion, three hundred eleven million, thirty thousand, twenty-one".