3220121122661 has 2 divisors, whose sum is σ = 3220121122662. Its totient is φ = 3220121122660.

The previous prime is 3220121122633. The next prime is 3220121122679. The reversal of 3220121122661 is 1662211210223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1885705704100 + 1334415418561 = 1373210^2 + 1155169^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220121122661 - 2¹⁴ = 3220121106277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3220121622661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610060561330 + 1610060561331.

It is an arithmetic number, because the mean of its divisors is an integer number (1610060561331).

Almost surely, 2^{3220121122661} is an apocalyptic number.

It is an amenable number.

3220121122661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3220121122661 is an equidigital number, since it uses as much as digits as its factorization.

3220121122661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 3220121122661 its reverse (1662211210223), we get a palindrome (4882332332884).

The spelling of 3220121122661 in words is "three trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, six hundred sixty-one".