1221420141 has 20 divisors (see below), whose sum is σ = 1854509404. Its totient is φ = 800928000.

The previous prime is 1221420127. The next prime is 1221420227. The reversal of 1221420141 is 1410241221.

It can be written as a sum of positive squares in 2 ways, for example, as 295496100 + 925924041 = 17190^2 + 30429^2 .

It is not a de Polignac number, because 1221420141 - 2¹³ = 1221411949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221428141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 118660 + ... + 128541.

Almost surely, 2^1221420141 is an apocalyptic number.

It is an amenable number.

1221420141 is a deficient number, since it is larger than the sum of its proper divisors (633089263).

1221420141 is an equidigital number, since it uses as much as digits as its factorization.

1221420141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247274 (or 247265 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1221420141 is about 34948.8217397955. The cubic root of 1221420141 is about 1068.9441767224.

Adding to 1221420141 its reverse (1410241221), we get a palindrome (2631661362).

The spelling of 1221420141 in words is "one billion, two hundred twenty-one million, four hundred twenty thousand, one hundred forty-one".