221421255546507 has 8 divisors (see below), whose sum is σ = 297209738989200. Its totient is φ = 146623471234080.

The previous prime is 221421255546473. The next prime is 221421255546509. The reversal of 221421255546507 is 705645552124122.

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

It is not a de Polignac number, because 221421255546507 - 2¹¹ = 221421255544459 is a prime.

It is a super-2 number, since 2×221421255546507² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221421255546507.

It is not an unprimeable number, because it can be changed into a prime (221421255546509) 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, 247674782044 + ... + 247674782937.

It is an arithmetic number, because the mean of its divisors is an integer number (37151217373650).

Almost surely, 2^{221421255546507} is an apocalyptic number.

221421255546507 is a deficient number, since it is larger than the sum of its proper divisors (75788483442693).

221421255546507 is a wasteful number, since it uses less digits than its factorization.

221421255546507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495349565133.

The product of its (nonzero) digits is 6720000, while the sum is 51.

The spelling of 221421255546507 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-six thousand, five hundred seven".