1220002111021 has 2 divisors, whose sum is σ = 1220002111022. Its totient is φ = 1220002111020.

The previous prime is 1220002111007. The next prime is 1220002111087. The reversal of 1220002111021 is 1201112000221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1208704546921 + 11297564100 = 1099411^2 + 106290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220002111021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220002110992 and 1220002111010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220002111621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610001055510 + 610001055511.

It is an arithmetic number, because the mean of its divisors is an integer number (610001055511).

Almost surely, 2^{1220002111021} is an apocalyptic number.

It is an amenable number.

1220002111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220002111021 is an equidigital number, since it uses as much as digits as its factorization.

1220002111021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1220002111021 its reverse (1201112000221), we get a palindrome (2421114111242).

The spelling of 1220002111021 in words is "one trillion, two hundred twenty billion, two million, one hundred eleven thousand, twenty-one".