221672054 has 4 divisors (see below), whose sum is σ = 332508084. Its totient is φ = 110836026.

The previous prime is 221672051. The next prime is 221672071. The reversal of 221672054 is 450276122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 450276122 = 2 ⋅225138061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221672051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55418012 + ... + 55418015.

It is an arithmetic number, because the mean of its divisors is an integer number (83127021).

Almost surely, 2^221672054 is an apocalyptic number.

221672054 is a deficient number, since it is larger than the sum of its proper divisors (110836030).

221672054 is a wasteful number, since it uses less digits than its factorization.

221672054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110836029.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 221672054 is about 14888.6552112674. The cubic root of 221672054 is about 605.2065901945.

The spelling of 221672054 in words is "two hundred twenty-one million, six hundred seventy-two thousand, fifty-four".