221435643454 has 4 divisors (see below), whose sum is σ = 332153465184. Its totient is φ = 110717821726.

The previous prime is 221435643449. The next prime is 221435643497. The reversal of 221435643454 is 454346534122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221435643454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55358910862 + ... + 55358910865.

It is an arithmetic number, because the mean of its divisors is an integer number (83038366296).

Almost surely, 2^221435643454 is an apocalyptic number.

221435643454 is a deficient number, since it is larger than the sum of its proper divisors (110717821730).

221435643454 is a wasteful number, since it uses less digits than its factorization.

221435643454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110717821729.

The product of its digits is 1382400, while the sum is 43.

The spelling of 221435643454 in words is "two hundred twenty-one billion, four hundred thirty-five million, six hundred forty-three thousand, four hundred fifty-four".