221004220421423 has 2 divisors, whose sum is σ = 221004220421424. Its totient is φ = 221004220421422.

The previous prime is 221004220421407. The next prime is 221004220421431. The reversal of 221004220421423 is 324124022400122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221004220421423 - 2⁴ = 221004220421407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221004220121423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110502110210711 + 110502110210712.

It is an arithmetic number, because the mean of its divisors is an integer number (110502110210712).

Almost surely, 2^{221004220421423} is an apocalyptic number.

221004220421423 is a deficient number, since it is larger than the sum of its proper divisors (1).

221004220421423 is an equidigital number, since it uses as much as digits as its factorization.

221004220421423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 221004220421423 its reverse (324124022400122), we get a palindrome (545128242821545).

The spelling of 221004220421423 in words is "two hundred twenty-one trillion, four billion, two hundred twenty million, four hundred twenty-one thousand, four hundred twenty-three".