121211153 has 6 divisors (see below), whose sum is σ = 141000786. Its totient is φ = 103895232.

The previous prime is 121211137. The next prime is 121211179. The reversal of 121211153 is 351112121.

It can be written as a sum of positive squares in only one way, i.e., 107910544 + 13300609 = 10388^2 + 3647^2 .

It is not a de Polignac number, because 121211153 - 2⁴ = 121211137 is a prime.

It is a super-2 number, since 2×121211153² = 29384287223178818, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121211113) 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, 1236800 + ... + 1236897.

It is an arithmetic number, because the mean of its divisors is an integer number (23500131).

Almost surely, 2^121211153 is an apocalyptic number.

It is an amenable number.

121211153 is a deficient number, since it is larger than the sum of its proper divisors (19789633).

121211153 is an equidigital number, since it uses as much as digits as its factorization.

121211153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473711 (or 2473704 counting only the distinct ones).

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

The square root of 121211153 is about 11009.5936800592. The cubic root of 121211153 is about 494.8962854503.

Adding to 121211153 its reverse (351112121), we get a palindrome (472323274).

The spelling of 121211153 in words is "one hundred twenty-one million, two hundred eleven thousand, one hundred fifty-three".