221554136265146 has 4 divisors (see below), whose sum is σ = 332331204397722. Its totient is φ = 110777068132572.

The previous prime is 221554136265139. The next prime is 221554136265179. The reversal of 221554136265146 is 641562631455122.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 140752716405625 + 80801419859521 = 11863925^2 + 8988961^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55388534066285 + ... + 55388534066288.

Almost surely, 2^{221554136265146} is an apocalyptic number.

221554136265146 is a deficient number, since it is larger than the sum of its proper divisors (110777068132576).

221554136265146 is a wasteful number, since it uses less digits than its factorization.

221554136265146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110777068132575.

The product of its digits is 10368000, while the sum is 53.

The spelling of 221554136265146 in words is "two hundred twenty-one trillion, five hundred fifty-four billion, one hundred thirty-six million, two hundred sixty-five thousand, one hundred forty-six".