221421251425747 has 4 divisors (see below), whose sum is σ = 221428509027840. Its totient is φ = 221413993823656.

The previous prime is 221421251425667. The next prime is 221421251425757. The reversal of 221421251425747 is 747524152124122.

It is a happy number.

221421251425747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221421251425747 - 2¹¹ = 221421251423699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221421251425747.

It is not an unprimeable number, because it can be changed into a prime (221421251425757) 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, 3628755283 + ... + 3628816300.

It is an arithmetic number, because the mean of its divisors is an integer number (55357127256960).

Almost surely, 2^{221421251425747} is an apocalyptic number.

221421251425747 is a deficient number, since it is larger than the sum of its proper divisors (7257602093).

221421251425747 is an equidigital number, since it uses as much as digits as its factorization.

221421251425747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7257602092.

The product of its digits is 2508800, while the sum is 49.

The spelling of 221421251425747 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, four hundred twenty-five thousand, seven hundred forty-seven".