221280324485451 has 128 divisors (see below), whose sum is σ = 384543887616000. Its totient is φ = 112135645440000.

The previous prime is 221280324485383. The next prime is 221280324485459. The reversal of 221280324485451 is 154584423082122.

It is not a de Polignac number, because 221280324485451 - 2²¹ = 221280322388299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221280324485394 and 221280324485403.

It is not an unprimeable number, because it can be changed into a prime (221280324485459) 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 127 ways as a sum of consecutive naturals, for example, 6250662351 + ... + 6250697751.

It is an arithmetic number, because the mean of its divisors is an integer number (3004249122000).

Almost surely, 2^{221280324485451} is an apocalyptic number.

221280324485451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221280324485451 is a deficient number, since it is larger than the sum of its proper divisors (163263563130549).

221280324485451 is a wasteful number, since it uses less digits than its factorization.

221280324485451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48946 (or 48932 counting only the distinct ones).

The product of its (nonzero) digits is 4915200, while the sum is 51.

The spelling of 221280324485451 in words is "two hundred twenty-one trillion, two hundred eighty billion, three hundred twenty-four million, four hundred eighty-five thousand, four hundred fifty-one".