221421207454762 has 12 divisors (see below), whose sum is σ = 386357413007970. Its totient is φ = 94894803194856.

The previous prime is 221421207454663. The next prime is 221421207454781. The reversal of 221421207454762 is 267454702124122.

It can be written as a sum of positive squares in only one way, i.e., 148918553961961 + 72502653492801 = 12203219^2 + 8514849^2 .

It is a super-2 number, since 2×221421207454762² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1129700037937 + ... + 1129700038132.

Almost surely, 2^{221421207454762} is an apocalyptic number.

221421207454762 is a deficient number, since it is larger than the sum of its proper divisors (164936205553208).

221421207454762 is a wasteful number, since it uses less digits than its factorization.

221421207454762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259400076085 (or 2259400076078 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 49.

Adding to 221421207454762 its reverse (267454702124122), we get a palindrome (488875909578884).

The spelling of 221421207454762 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-two".