121201551253 has 4 divisors (see below), whose sum is σ = 121204067980. Its totient is φ = 121199034528.

The previous prime is 121201551227. The next prime is 121201551257. The reversal of 121201551253 is 352155102121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75327193764 + 45874357489 = 274458^2 + 214183^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201551253 - 2⁹ = 121201550741 is a prime.

It is a super-2 number, since 2×121201551253² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201551257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184688 + ... + 1282921.

It is an arithmetic number, because the mean of its divisors is an integer number (30301016995).

Almost surely, 2^121201551253 is an apocalyptic number.

It is an amenable number.

121201551253 is a deficient number, since it is larger than the sum of its proper divisors (2516727).

121201551253 is an equidigital number, since it uses as much as digits as its factorization.

121201551253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516726.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 121201551253 its reverse (352155102121), we get a palindrome (473356653374).

The spelling of 121201551253 in words is "one hundred twenty-one billion, two hundred one million, five hundred fifty-one thousand, two hundred fifty-three".