1220021011021 has 4 divisors (see below), whose sum is σ = 1284232643200. Its totient is φ = 1155809378844.

The previous prime is 1220021010977. The next prime is 1220021011037. The reversal of 1220021011021 is 1201101200221.

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 a de Polignac number, because none of the positive numbers 2^k-1220021011021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220021010992 and 1220021011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021011061) 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 3 ways as a sum of consecutive naturals, for example, 32105816061 + ... + 32105816098.

It is an arithmetic number, because the mean of its divisors is an integer number (321058160800).

Almost surely, 2^{1220021011021} is an apocalyptic number.

It is an amenable number.

1220021011021 is a deficient number, since it is larger than the sum of its proper divisors (64211632179).

1220021011021 is an equidigital number, since it uses as much as digits as its factorization.

1220021011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64211632178.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1220021011021 its reverse (1201101200221), we get a palindrome (2421122211242).

The spelling of 1220021011021 in words is "one trillion, two hundred twenty billion, twenty-one million, eleven thousand, twenty-one".