221147013 has 4 divisors (see below), whose sum is σ = 294862688. Its totient is φ = 147431340.

The previous prime is 221146993. The next prime is 221147027. The reversal of 221147013 is 310741122.

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 221147013 - 2¹² = 221142917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221147063) 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, 36857833 + ... + 36857838.

It is an arithmetic number, because the mean of its divisors is an integer number (73715672).

Almost surely, 2^221147013 is an apocalyptic number.

It is an amenable number.

221147013 is a deficient number, since it is larger than the sum of its proper divisors (73715675).

221147013 is an equidigital number, since it uses as much as digits as its factorization.

221147013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73715674.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 221147013 is about 14871.0125075598. The cubic root of 221147013 is about 604.7283920733.

Adding to 221147013 its reverse (310741122), we get a palindrome (531888135).

The spelling of 221147013 in words is "two hundred twenty-one million, one hundred forty-seven thousand, thirteen".