221154920423 has 4 divisors (see below), whose sum is σ = 221781421968. Its totient is φ = 220528418880.

The previous prime is 221154920411. The next prime is 221154920443. The reversal of 221154920423 is 324029451122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221154920423 - 2¹⁴ = 221154904039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221154920443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313250243 + ... + 313250948.

It is an arithmetic number, because the mean of its divisors is an integer number (55445355492).

Almost surely, 2^221154920423 is an apocalyptic number.

221154920423 is a deficient number, since it is larger than the sum of its proper divisors (626501545).

221154920423 is an equidigital number, since it uses as much as digits as its factorization.

221154920423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626501544.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 221154920423 in words is "two hundred twenty-one billion, one hundred fifty-four million, nine hundred twenty thousand, four hundred twenty-three".