221427634851843 has 24 divisors (see below), whose sum is σ = 343999039748688. Its totient is φ = 126323665788096.

The previous prime is 221427634851779. The next prime is 221427634851847. The reversal of 221427634851843 is 348158436724122.

It is not a de Polignac number, because 221427634851843 - 2⁶ = 221427634851779 is a prime.

It is a super-2 number, since 2×221427634851843² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221427634851847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1228548096 + ... + 1228728317.

It is an arithmetic number, because the mean of its divisors is an integer number (14333293322862).

Almost surely, 2^{221427634851843} is an apocalyptic number.

221427634851843 is a deficient number, since it is larger than the sum of its proper divisors (122571404896845).

221427634851843 is a wasteful number, since it uses less digits than its factorization.

221427634851843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457277043 (or 2457277036 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 60.

The spelling of 221427634851843 in words is "two hundred twenty-one trillion, four hundred twenty-seven billion, six hundred thirty-four million, eight hundred fifty-one thousand, eight hundred forty-three".