1220101200421 has 2 divisors, whose sum is σ = 1220101200422. Its totient is φ = 1220101200420.

The previous prime is 1220101200419. The next prime is 1220101200449. The reversal of 1220101200421 is 1240021010221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217902059396 + 2199141025 = 1103586^2 + 46895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220101200421 - 2¹ = 1220101200419 is a prime.

Together with 1220101200419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1220101200395 and 1220101200404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220101200121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610050600210 + 610050600211.

It is an arithmetic number, because the mean of its divisors is an integer number (610050600211).

Almost surely, 2^{1220101200421} is an apocalyptic number.

It is an amenable number.

1220101200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220101200421 is an equidigital number, since it uses as much as digits as its factorization.

1220101200421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1220101200421 its reverse (1240021010221), we get a palindrome (2460122210642).

The spelling of 1220101200421 in words is "one trillion, two hundred twenty billion, one hundred one million, two hundred thousand, four hundred twenty-one".