221534451744551 has 32 divisors (see below), whose sum is σ = 249593460480000. Its totient is φ = 194801820825600.

The previous prime is 221534451744523. The next prime is 221534451744559. The reversal of 221534451744551 is 155447154435122.

221534451744551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221534451744551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221534451744493 and 221534451744502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221534451744559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8439716075 + ... + 8439742323.

It is an arithmetic number, because the mean of its divisors is an integer number (7799795640000).

Almost surely, 2^{221534451744551} is an apocalyptic number.

221534451744551 is a deficient number, since it is larger than the sum of its proper divisors (28059008735449).

221534451744551 is a wasteful number, since it uses less digits than its factorization.

221534451744551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37607.

The product of its digits is 13440000, while the sum is 53.

The spelling of 221534451744551 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred fifty-one million, seven hundred forty-four thousand, five hundred fifty-one".