221421251727073 has 4 divisors (see below), whose sum is σ = 221426362946308. Its totient is φ = 221416140507840.

The previous prime is 221421251727031. The next prime is 221421251727079. The reversal of 221421251727073 is 370727152124122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 131610982785489 + 89810268941584 = 11472183^2 + 9476828^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421251727073 - 2⁹ = 221421251726561 is a prime.

It is a super-2 number, since 2×221421251727073² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221421251727079) 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, 2555544636 + ... + 2555631277.

It is an arithmetic number, because the mean of its divisors is an integer number (55356590736577).

Almost surely, 2^{221421251727073} is an apocalyptic number.

It is an amenable number.

221421251727073 is a deficient number, since it is larger than the sum of its proper divisors (5111219235).

221421251727073 is an equidigital number, since it uses as much as digits as its factorization.

221421251727073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111219234.

The product of its (nonzero) digits is 658560, while the sum is 46.

The spelling of 221421251727073 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, seven hundred twenty-seven thousand, seventy-three".