1120661721 has 6 divisors (see below), whose sum is σ = 1618733610. Its totient is φ = 747107808.

The previous prime is 1120661701. The next prime is 1120661771. The reversal of 1120661721 is 1271660211.

It is a happy number.

1120661721 is a `hidden beast` number, since 1 + 1 + 20 + 6 + 617 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 848906496 + 271755225 = 29136^2 + 16485^2 .

It is not a de Polignac number, because 1120661721 - 2⁷ = 1120661593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1120661701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62258976 + ... + 62258993.

It is an arithmetic number, because the mean of its divisors is an integer number (269788935).

Almost surely, 2^1120661721 is an apocalyptic number.

It is an amenable number.

1120661721 is a deficient number, since it is larger than the sum of its proper divisors (498071889).

1120661721 is a wasteful number, since it uses less digits than its factorization.

1120661721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124517975 (or 124517972 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1120661721 is about 33476.2859499079. The cubic root of 1120661721 is about 1038.7033028658.

It can be divided in two parts, 11206 and 61721, that added together give a palindrome (72927).

The spelling of 1120661721 in words is "one billion, one hundred twenty million, six hundred sixty-one thousand, seven hundred twenty-one".