1153210121 has 4 divisors (see below), whose sum is σ = 1317954432. Its totient is φ = 988465812.

The previous prime is 1153210109. The next prime is 1153210139. The reversal of 1153210121 is 1210123511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1153210121 - 2⁶ = 1153210057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1153210121.

It is not an unprimeable number, because it can be changed into a prime (1153210151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82372145 + ... + 82372158.

It is an arithmetic number, because the mean of its divisors is an integer number (329488608).

Almost surely, 2^1153210121 is an apocalyptic number.

It is an amenable number.

1153210121 is a deficient number, since it is larger than the sum of its proper divisors (164744311).

1153210121 is an equidigital number, since it uses as much as digits as its factorization.

1153210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164744310.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1153210121 is about 33958.9475838107. The cubic root of 1153210121 is about 1048.6634910599.

Adding to 1153210121 its reverse (1210123511), we get a palindrome (2363333632).

The spelling of 1153210121 in words is "one billion, one hundred fifty-three million, two hundred ten thousand, one hundred twenty-one".