121525221001 has 4 divisors (see below), whose sum is σ = 123236843904. Its totient is φ = 119813598100.

The previous prime is 121525220981. The next prime is 121525221019. The reversal of 121525221001 is 100122525121.

It is a happy number.

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 121525221001 - 2¹¹ = 121525218953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121525221091) 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, 855811345 + ... + 855811486.

It is an arithmetic number, because the mean of its divisors is an integer number (30809210976).

Almost surely, 2^121525221001 is an apocalyptic number.

It is an amenable number.

121525221001 is a deficient number, since it is larger than the sum of its proper divisors (1711622903).

121525221001 is an equidigital number, since it uses as much as digits as its factorization.

121525221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711622902.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 121525221001 its reverse (100122525121), we get a palindrome (221647746122).

The spelling of 121525221001 in words is "one hundred twenty-one billion, five hundred twenty-five million, two hundred twenty-one thousand, one".