1221479660201 has 2 divisors, whose sum is σ = 1221479660202. Its totient is φ = 1221479660200.

The previous prime is 1221479660131. The next prime is 1221479660237. The reversal of 1221479660201 is 1020669741221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194760488601 + 26719171600 = 1093051^2 + 163460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221479660201 - 2¹⁸ = 1221479398057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221479660501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610739830100 + 610739830101.

It is an arithmetic number, because the mean of its divisors is an integer number (610739830101).

Almost surely, 2^{1221479660201} is an apocalyptic number.

It is an amenable number.

1221479660201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221479660201 is an equidigital number, since it uses as much as digits as its factorization.

1221479660201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 1221479660201 in words is "one trillion, two hundred twenty-one billion, four hundred seventy-nine million, six hundred sixty thousand, two hundred one".