1220002021001 has 2 divisors, whose sum is σ = 1220002021002. Its totient is φ = 1220002021000.

The previous prime is 1220002020983. The next prime is 1220002021009. The reversal of 1220002021001 is 1001202000221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 783444495376 + 436557525625 = 885124^2 + 660725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220002021001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220002021009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610001010500 + 610001010501.

It is an arithmetic number, because the mean of its divisors is an integer number (610001010501).

Almost surely, 2^{1220002021001} is an apocalyptic number.

It is an amenable number.

1220002021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220002021001 is an equidigital number, since it uses as much as digits as its factorization.

1220002021001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1220002021001 its reverse (1001202000221), we get a palindrome (2221204021222).

The spelling of 1220002021001 in words is "one trillion, two hundred twenty billion, two million, twenty-one thousand, one".