221012013 has 4 divisors (see below), whose sum is σ = 294682688. Its totient is φ = 147341340.

The previous prime is 221011993. The next prime is 221012039. The reversal of 221012013 is 310210122.

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 not a de Polignac number, because 221012013 - 2¹⁴ = 220995629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221012013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012413) 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, 36835333 + ... + 36835338.

It is an arithmetic number, because the mean of its divisors is an integer number (73670672).

Almost surely, 2^221012013 is an apocalyptic number.

It is an amenable number.

221012013 is a deficient number, since it is larger than the sum of its proper divisors (73670675).

221012013 is an equidigital number, since it uses as much as digits as its factorization.

221012013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73670674.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221012013 is about 14866.4727827417. The cubic root of 221012013 is about 604.6053141419.

Adding to 221012013 its reverse (310210122), we get a palindrome (531222135).

The spelling of 221012013 in words is "two hundred twenty-one million, twelve thousand, thirteen".