1221144124 has 6 divisors (see below), whose sum is σ = 2137002224. Its totient is φ = 610572060.

The previous prime is 1221144121. The next prime is 1221144139. The reversal of 1221144124 is 4214411221.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221144095 and 1221144104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221144121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152643012 + ... + 152643019.

Almost surely, 2^1221144124 is an apocalyptic number.

It is an amenable number.

1221144124 is a deficient number, since it is larger than the sum of its proper divisors (915858100).

1221144124 is a wasteful number, since it uses less digits than its factorization.

1221144124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305286035 (or 305286033 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 1221144124 is about 34944.8726424922. The cubic root of 1221144124 is about 1068.8636505156.

Adding to 1221144124 its reverse (4214411221), we get a palindrome (5435555345).

The spelling of 1221144124 in words is "one billion, two hundred twenty-one million, one hundred forty-four thousand, one hundred twenty-four".