221277217464 has 48 divisors (see below), whose sum is σ = 613909361520. Its totient is φ = 71960069760.

The previous prime is 221277217463. The next prime is 221277217507. The reversal of 221277217464 is 464712772122.

It is a super-2 number, since 2×221277217464² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221277217463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37476252 + ... + 37482155.

It is an arithmetic number, because the mean of its divisors is an integer number (12789778365).

Almost surely, 2^221277217464 is an apocalyptic number.

221277217464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221277217464 is an abundant number, since it is smaller than the sum of its proper divisors (392632144056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221277217464 is a wasteful number, since it uses less digits than its factorization.

221277217464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74958460 (or 74958453 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

Adding to 221277217464 its reverse (464712772122), we get a palindrome (685989989586).

The spelling of 221277217464 in words is "two hundred twenty-one billion, two hundred seventy-seven million, two hundred seventeen thousand, four hundred sixty-four".