1221444141 has 16 divisors (see below), whose sum is σ = 1700770176. Its totient is φ = 778264256.

The previous prime is 1221444109. The next prime is 1221444151. The reversal of 1221444141 is 1414441221.

It is a cyclic number.

It is not a de Polignac number, because 1221444141 - 2⁵ = 1221444109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221444151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88291 + ... + 101183.

It is an arithmetic number, because the mean of its divisors is an integer number (106298136).

Almost surely, 2^1221444141 is an apocalyptic number.

It is an amenable number.

1221444141 is a deficient number, since it is larger than the sum of its proper divisors (479326035).

1221444141 is a wasteful number, since it uses less digits than its factorization.

1221444141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14292.

The product of its digits is 1024, while the sum is 24.

The square root of 1221444141 is about 34949.1650973239. The cubic root of 1221444141 is about 1068.9511779967.

Adding to 1221444141 its reverse (1414441221), we get a palindrome (2635885362).

The spelling of 1221444141 in words is "one billion, two hundred twenty-one million, four hundred forty-four thousand, one hundred forty-one".