221542454 has 8 divisors (see below), whose sum is σ = 379787088. Its totient is φ = 94946760.

The previous prime is 221542439. The next prime is 221542459. The reversal of 221542454 is 454245122.

221542454 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221542459) 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, 7912217 + ... + 7912244.

It is an arithmetic number, because the mean of its divisors is an integer number (47473386).

Almost surely, 2^221542454 is an apocalyptic number.

221542454 is a deficient number, since it is larger than the sum of its proper divisors (158244634).

221542454 is a wasteful number, since it uses less digits than its factorization.

221542454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15824470.

The product of its digits is 12800, while the sum is 29.

The square root of 221542454 is about 14884.3022678257. The cubic root of 221542454 is about 605.0886230396.

Adding to 221542454 its reverse (454245122), we get a palindrome (675787576).

The spelling of 221542454 in words is "two hundred twenty-one million, five hundred forty-two thousand, four hundred fifty-four".