221534451770867 has 2 divisors, whose sum is σ = 221534451770868. Its totient is φ = 221534451770866.

The previous prime is 221534451770833. The next prime is 221534451770941. The reversal of 221534451770867 is 768077154435122.

221534451770867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221534451770867 - 2¹⁶ = 221534451705331 is a prime.

It is not a weakly prime, because it can be changed into another prime (221534451772867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110767225885433 + 110767225885434.

It is an arithmetic number, because the mean of its divisors is an integer number (110767225885434).

Almost surely, 2^{221534451770867} is an apocalyptic number.

221534451770867 is a deficient number, since it is larger than the sum of its proper divisors (1).

221534451770867 is an equidigital number, since it uses as much as digits as its factorization.

221534451770867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79027200, while the sum is 62.

The spelling of 221534451770867 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred fifty-one million, seven hundred seventy thousand, eight hundred sixty-seven".