1221041401 has 6 divisors (see below), whose sum is σ = 1244517470. Its totient is φ = 1198000128.

The previous prime is 1221041363. The next prime is 1221041429. The reversal of 1221041401 is 1041401221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 408848400 + 812193001 = 20220^2 + 28499^2 .

It is not a de Polignac number, because 1221041401 - 2²¹ = 1218944249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221081401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214536 + ... + 220153.

Almost surely, 2^1221041401 is an apocalyptic number.

It is an amenable number.

1221041401 is a deficient number, since it is larger than the sum of its proper divisors (23476069).

1221041401 is an frugal number, since it uses more digits than its factorization.

1221041401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434795 (or 434742 counting only the distinct ones).

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

The square root of 1221041401 is about 34943.4028251400. The cubic root of 1221041401 is about 1068.8336786345.

Adding to 1221041401 its reverse (1041401221), we get a palindrome (2262442622).

The spelling of 1221041401 in words is "one billion, two hundred twenty-one million, forty-one thousand, four hundred one".