1221150724 has 24 divisors (see below), whose sum is σ = 2192652000. Its totient is φ = 594726720.

The previous prime is 1221150703. The next prime is 1221150727. The reversal of 1221150724 is 4270511221.

It is not an unprimeable number, because it can be changed into a prime (1221150727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102427 + ... + 113725.

It is an arithmetic number, because the mean of its divisors is an integer number (91360500).

Almost surely, 2^1221150724 is an apocalyptic number.

It is an amenable number.

1221150724 is a deficient number, since it is larger than the sum of its proper divisors (971501276).

1221150724 is a wasteful number, since it uses less digits than its factorization.

1221150724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12003 (or 12001 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1221150724 is about 34944.9670768195. The cubic root of 1221150724 is about 1068.8655761653.

Adding to 1221150724 its reverse (4270511221), we get a palindrome (5491661945).

The spelling of 1221150724 in words is "one billion, two hundred twenty-one million, one hundred fifty thousand, seven hundred twenty-four".