221002012423 has 4 divisors (see below), whose sum is σ = 225171861768. Its totient is φ = 216832163080.

The previous prime is 221002012393. The next prime is 221002012463. The reversal of 221002012423 is 324210200122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002012423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221002012423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002012463) 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, 2084924593 + ... + 2084924698.

It is an arithmetic number, because the mean of its divisors is an integer number (56292965442).

Almost surely, 2^221002012423 is an apocalyptic number.

221002012423 is a deficient number, since it is larger than the sum of its proper divisors (4169849345).

221002012423 is an equidigital number, since it uses as much as digits as its factorization.

221002012423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169849344.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 221002012423 its reverse (324210200122), we get a palindrome (545212212545).

The spelling of 221002012423 in words is "two hundred twenty-one billion, two million, twelve thousand, four hundred twenty-three".