221640320552253 has 4 divisors (see below), whose sum is σ = 295520427403008. Its totient is φ = 147760213701500.

The previous prime is 221640320552213. The next prime is 221640320552309. The reversal of 221640320552253 is 352255023046122.

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 221640320552253 - 2¹³ = 221640320544061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221640320552213) 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, 36940053425373 + ... + 36940053425378.

It is an arithmetic number, because the mean of its divisors is an integer number (73880106850752).

Almost surely, 2^{221640320552253} is an apocalyptic number.

It is an amenable number.

221640320552253 is a deficient number, since it is larger than the sum of its proper divisors (73880106850755).

221640320552253 is an equidigital number, since it uses as much as digits as its factorization.

221640320552253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73880106850754.

The product of its (nonzero) digits is 864000, while the sum is 42.

Adding to 221640320552253 its reverse (352255023046122), we get a palindrome (573895343598375).

The spelling of 221640320552253 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred twenty million, five hundred fifty-two thousand, two hundred fifty-three".