221421255444743 has 4 divisors (see below), whose sum is σ = 221421617162880. Its totient is φ = 221420893726608.

The previous prime is 221421255444643. The next prime is 221421255444761. The reversal of 221421255444743 is 347444552124122.

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 221421255444743 - 2¹² = 221421255440647 is a prime.

It is a super-2 number, since 2×221421255444743² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221421255444691 and 221421255444700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421255444143) 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, 179939303 + ... + 181165656.

It is an arithmetic number, because the mean of its divisors is an integer number (55355404290720).

Almost surely, 2^{221421255444743} is an apocalyptic number.

221421255444743 is a deficient number, since it is larger than the sum of its proper divisors (361718137).

221421255444743 is an equidigital number, since it uses as much as digits as its factorization.

221421255444743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361718136.

The product of its digits is 8601600, while the sum is 50.

The spelling of 221421255444743 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, four hundred forty-four thousand, seven hundred forty-three".