221040500406 has 32 divisors (see below), whose sum is σ = 487045149696. Its totient is φ = 66318780000.

The previous prime is 221040500309. The next prime is 221040500407. The reversal of 221040500406 is 604005040122.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221040500407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16573030 + ... + 16586361.

It is an arithmetic number, because the mean of its divisors is an integer number (15220160928).

Almost surely, 2^221040500406 is an apocalyptic number.

221040500406 is an abundant number, since it is smaller than the sum of its proper divisors (266004649290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221040500406 is a wasteful number, since it uses less digits than its factorization.

221040500406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33159508.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 221040500406 its reverse (604005040122), we get a palindrome (825045540528).

The spelling of 221040500406 in words is "two hundred twenty-one billion, forty million, five hundred thousand, four hundred six".