1221130653 has 8 divisors (see below), whose sum is σ = 1658894688. Its totient is φ = 798726864.

The previous prime is 1221130643. The next prime is 1221130663. The reversal of 1221130653 is 3560311221.

1221130653 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1221130643) and next prime (1221130663).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221130653 - 2¹⁴ = 1221114269 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221130643) 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, 3839875 + ... + 3840192.

It is an arithmetic number, because the mean of its divisors is an integer number (207361836).

Almost surely, 2^1221130653 is an apocalyptic number.

It is an amenable number.

1221130653 is a deficient number, since it is larger than the sum of its proper divisors (437764035).

1221130653 is an equidigital number, since it uses as much as digits as its factorization.

1221130653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680123.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1221130653 is about 34944.6798955149. The cubic root of 1221130653 is about 1068.8597201264.

Adding to 1221130653 its reverse (3560311221), we get a palindrome (4781441874).

The spelling of 1221130653 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, six hundred fifty-three".