221421255544707 has 8 divisors (see below), whose sum is σ = 298271931868176. Its totient is φ = 146092374792192.

The previous prime is 221421255544681. The next prime is 221421255544717. The reversal of 221421255544707 is 707445552124122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221421255544707 - 2¹⁴ = 221421255528323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221421255544707.

It is not an unprimeable number, because it can be changed into a prime (221421255544717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380448892398 + ... + 380448892979.

It is an arithmetic number, because the mean of its divisors is an integer number (37283991483522).

Almost surely, 2^{221421255544707} is an apocalyptic number.

221421255544707 is a deficient number, since it is larger than the sum of its proper divisors (76850676323469).

221421255544707 is an equidigital number, since it uses as much as digits as its factorization.

221421255544707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760897785477.

The product of its (nonzero) digits is 6272000, while the sum is 51.

The spelling of 221421255544707 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, seven hundred seven".