220000012521 has 4 divisors (see below), whose sum is σ = 293333350032. Its totient is φ = 146666675012.

The previous prime is 220000012511. The next prime is 220000012537. The reversal of 220000012521 is 125210000022.

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 220000012521 - 2¹⁴ = 219999996137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220000012521.

It is not an unprimeable number, because it can be changed into a prime (220000012511) 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, 36666668751 + ... + 36666668756.

It is an arithmetic number, because the mean of its divisors is an integer number (73333337508).

Almost surely, 2^220000012521 is an apocalyptic number.

It is an amenable number.

220000012521 is a deficient number, since it is larger than the sum of its proper divisors (73333337511).

220000012521 is an equidigital number, since it uses as much as digits as its factorization.

220000012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73333337510.

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 220000012521 its reverse (125210000022), we get a palindrome (345210012543).

The spelling of 220000012521 in words is "two hundred twenty billion, twelve thousand, five hundred twenty-one".