221054399 has 4 divisors (see below), whose sum is σ = 221084136. Its totient is φ = 221024664.

The previous prime is 221054371. The next prime is 221054401. The reversal of 221054399 is 993450122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221054399 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 (221054359) 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, 7352 + ... + 22274.

It is an arithmetic number, because the mean of its divisors is an integer number (55271034).

Almost surely, 2^221054399 is an apocalyptic number.

221054399 is a deficient number, since it is larger than the sum of its proper divisors (29737).

221054399 is a wasteful number, since it uses less digits than its factorization.

221054399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29736.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 221054399 is about 14867.8982711075. The cubic root of 221054399 is about 604.6439623620.

The spelling of 221054399 in words is "two hundred twenty-one million, fifty-four thousand, three hundred ninety-nine".