1221144519 has 16 divisors (see below), whose sum is σ = 1861396992. Its totient is φ = 697569888.

The previous prime is 1221144503. The next prime is 1221144523. The reversal of 1221144519 is 9154411221.

It is not a de Polignac number, because 1221144519 - 2⁴ = 1221144503 is a prime.

It is a super-2 number, since 2×1221144519² = 2982387872567482722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221144019) 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, 73597 + ... + 88649.

It is an arithmetic number, because the mean of its divisors is an integer number (116337312).

Almost surely, 2^1221144519 is an apocalyptic number.

1221144519 is a deficient number, since it is larger than the sum of its proper divisors (640252473).

1221144519 is a wasteful number, since it uses less digits than its factorization.

1221144519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18926.

The product of its digits is 2880, while the sum is 30.

The square root of 1221144519 is about 34944.8782942508. The cubic root of 1221144519 is about 1068.8637657630.

The spelling of 1221144519 in words is "one billion, two hundred twenty-one million, one hundred forty-four thousand, five hundred nineteen".