221421207454761 has 8 divisors (see below), whose sum is σ = 295293204769824. Its totient is φ = 147581674221440.

The previous prime is 221421207454663. The next prime is 221421207454781. The reversal of 221421207454761 is 167454702124122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221421207454761 - 2²³ = 221421199066153 is a prime.

It is a super-2 number, since 2×221421207454761² (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 221421207454761.

It is not an unprimeable number, because it can be changed into a prime (221421207454781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8116004520 + ... + 8116031801.

It is an arithmetic number, because the mean of its divisors is an integer number (36911650596228).

Almost surely, 2^{221421207454761} is an apocalyptic number.

It is an amenable number.

221421207454761 is a deficient number, since it is larger than the sum of its proper divisors (73871997315063).

221421207454761 is a wasteful number, since it uses less digits than its factorization.

221421207454761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16232040871.

The product of its (nonzero) digits is 1505280, while the sum is 48.

Adding to 221421207454761 its reverse (167454702124122), we get a palindrome (388875909578883).

The spelling of 221421207454761 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred seven million, four hundred fifty-four thousand, seven hundred sixty-one".