121210522521 has 8 divisors (see below), whose sum is σ = 176306214624. Its totient is φ = 73460922720.

The previous prime is 121210522519. The next prime is 121210522549. The reversal of 121210522521 is 125225012121.

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

It is not a de Polignac number, because 121210522521 - 2¹ = 121210522519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121210522491 and 121210522500.

It is not an unprimeable number, because it can be changed into a prime (121210522561) 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, 1836523036 + ... + 1836523101.

It is an arithmetic number, because the mean of its divisors is an integer number (22038276828).

Almost surely, 2^121210522521 is an apocalyptic number.

121210522521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121210522521 is a deficient number, since it is larger than the sum of its proper divisors (55095692103).

121210522521 is a wasteful number, since it uses less digits than its factorization.

121210522521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673046151.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 121210522521 its reverse (125225012121), we get a palindrome (246435534642).

Subtracting 121210522521 from its reverse (125225012121), we obtain a square (4014489600 = 63360²).

The spelling of 121210522521 in words is "one hundred twenty-one billion, two hundred ten million, five hundred twenty-two thousand, five hundred twenty-one".