221421205523463 has 32 divisors (see below), whose sum is σ = 323181768886272. Its totient is φ = 133731062863200.

The previous prime is 221421205523461. The next prime is 221421205523477. The reversal of 221421205523463 is 364325502124122.

It is not a de Polignac number, because 221421205523463 - 2¹ = 221421205523461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421205523461) 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 31 ways as a sum of consecutive naturals, for example, 1252108 + ... + 21081038.

It is an arithmetic number, because the mean of its divisors is an integer number (10099430277696).

Almost surely, 2^{221421205523463} is an apocalyptic number.

221421205523463 is a deficient number, since it is larger than the sum of its proper divisors (101760563362809).

221421205523463 is a wasteful number, since it uses less digits than its factorization.

221421205523463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19830115.

The product of its (nonzero) digits is 691200, while the sum is 42.

Adding to 221421205523463 its reverse (364325502124122), we get a palindrome (585746707647585).

The spelling of 221421205523463 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred five million, five hundred twenty-three thousand, four hundred sixty-three".