1221220022201 has 2 divisors, whose sum is σ = 1221220022202. Its totient is φ = 1221220022200.

The previous prime is 1221220022167. The next prime is 1221220022227. The reversal of 1221220022201 is 1022200221221.

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., 1221124452025 + 95570176 = 1105045^2 + 9776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221220022201 is a prime.

It is a super-2 number, since 2×1221220022201² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221220022201.

It is not a weakly prime, because it can be changed into another prime (1221220022251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610011100 + 610610011101.

It is an arithmetic number, because the mean of its divisors is an integer number (610610011101).

Almost surely, 2^{1221220022201} is an apocalyptic number.

It is an amenable number.

1221220022201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221220022201 is an equidigital number, since it uses as much as digits as its factorization.

1221220022201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221220022201 its reverse (1022200221221), we get a palindrome (2243420243422).

The spelling of 1221220022201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred one".