121525052521 has 8 divisors (see below), whose sum is σ = 122802022280. Its totient is φ = 120248575488.

The previous prime is 121525052491. The next prime is 121525052533. The reversal of 121525052521 is 125250525121.

It can be written as a sum of positive squares in 4 ways, for example, as 6579643225 + 114945409296 = 81115^2 + 339036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121525052521 - 2¹¹ = 121525050473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121525052591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383575 + ... + 624643.

It is an arithmetic number, because the mean of its divisors is an integer number (15350252785).

Almost surely, 2^121525052521 is an apocalyptic number.

It is an amenable number.

121525052521 is a deficient number, since it is larger than the sum of its proper divisors (1276969759).

121525052521 is an equidigital number, since it uses as much as digits as its factorization.

121525052521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246363.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 121525052521 its reverse (125250525121), we get a palindrome (246775577642).

The spelling of 121525052521 in words is "one hundred twenty-one billion, five hundred twenty-five million, fifty-two thousand, five hundred twenty-one".