221315005302551 has 4 divisors (see below), whose sum is σ = 225066107087400. Its totient is φ = 217563903517704.

The previous prime is 221315005302499. The next prime is 221315005302553. The reversal of 221315005302551 is 155203500513122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221315005302551 - 2⁶ = 221315005302487 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 (221315005302553) 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, 1875550892336 + ... + 1875550892453.

It is an arithmetic number, because the mean of its divisors is an integer number (56266526771850).

Almost surely, 2^{221315005302551} is an apocalyptic number.

221315005302551 is a deficient number, since it is larger than the sum of its proper divisors (3751101784849).

221315005302551 is an equidigital number, since it uses as much as digits as its factorization.

221315005302551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751101784848.

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 221315005302551 its reverse (155203500513122), we get a palindrome (376518505815673).

The spelling of 221315005302551 in words is "two hundred twenty-one trillion, three hundred fifteen billion, five million, three hundred two thousand, five hundred fifty-one".