221534455631446 has 4 divisors (see below), whose sum is σ = 332301683447172. Its totient is φ = 110767227815722.

The previous prime is 221534455631417. The next prime is 221534455631507. The reversal of 221534455631446 is 644136554435122.

It is a happy number.

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

It is a super-2 number, since 2×221534455631446² (a number of 29 digits) contains 22 as substring.

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, 55383613907860 + ... + 55383613907863.

It is an arithmetic number, because the mean of its divisors is an integer number (83075420861793).

Almost surely, 2^{221534455631446} is an apocalyptic number.

221534455631446 is a deficient number, since it is larger than the sum of its proper divisors (110767227815726).

221534455631446 is a wasteful number, since it uses less digits than its factorization.

221534455631446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110767227815725.

The product of its digits is 41472000, while the sum is 55.

The spelling of 221534455631446 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred fifty-five million, six hundred thirty-one thousand, four hundred forty-six".