1221420041 has 4 divisors (see below), whose sum is σ = 1233278592. Its totient is φ = 1209561492.

The previous prime is 1221420007. The next prime is 1221420047. The reversal of 1221420041 is 1400241221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1400241221 = 13457 ⋅104053.

It is a cyclic number.

It is not a de Polignac number, because 1221420041 - 2²⁶ = 1154311177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221420047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5929121 + ... + 5929326.

It is an arithmetic number, because the mean of its divisors is an integer number (308319648).

Almost surely, 2^1221420041 is an apocalyptic number.

It is an amenable number.

1221420041 is a deficient number, since it is larger than the sum of its proper divisors (11858551).

1221420041 is a wasteful number, since it uses less digits than its factorization.

1221420041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11858550.

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

The square root of 1221420041 is about 34948.8203091320. The cubic root of 1221420041 is about 1068.9441475502.

Adding to 1221420041 its reverse (1400241221), we get a palindrome (2621661262).

The spelling of 1221420041 in words is "one billion, two hundred twenty-one million, four hundred twenty thousand, forty-one".