133121255021 has 4 divisors (see below), whose sum is σ = 133421754912. Its totient is φ = 132820755132.

The previous prime is 133121255011. The next prime is 133121255027. The reversal of 133121255021 is 120552121331.

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 133121255021 - 2¹⁰ = 133121253997 is a prime.

It is a super-2 number, since 2×133121255021² (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 (133121255027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150249281 + ... + 150250166.

It is an arithmetic number, because the mean of its divisors is an integer number (33355438728).

Almost surely, 2^133121255021 is an apocalyptic number.

It is an amenable number.

133121255021 is a deficient number, since it is larger than the sum of its proper divisors (300499891).

133121255021 is an equidigital number, since it uses as much as digits as its factorization.

133121255021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300499890.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 133121255021 its reverse (120552121331), we get a palindrome (253673376352).

The spelling of 133121255021 in words is "one hundred thirty-three billion, one hundred twenty-one million, two hundred fifty-five thousand, twenty-one".