221543155346613 has 4 divisors (see below), whose sum is σ = 295390873795488. Its totient is φ = 147695436897740.

The previous prime is 221543155346603. The next prime is 221543155346647. The reversal of 221543155346613 is 316643551345122.

221543155346613 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 221543155346613 - 2⁵ = 221543155346581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221543155346603) 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, 36923859224433 + ... + 36923859224438.

It is an arithmetic number, because the mean of its divisors is an integer number (73847718448872).

Almost surely, 2^{221543155346613} is an apocalyptic number.

It is an amenable number.

221543155346613 is a deficient number, since it is larger than the sum of its proper divisors (73847718448875).

221543155346613 is an equidigital number, since it uses as much as digits as its factorization.

221543155346613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73847718448874.

The product of its digits is 7776000, while the sum is 51.

The spelling of 221543155346613 in words is "two hundred twenty-one trillion, five hundred forty-three billion, one hundred fifty-five million, three hundred forty-six thousand, six hundred thirteen".