221334133540 has 24 divisors (see below), whose sum is σ = 500555656440. Its totient is φ = 81723372288.

The previous prime is 221334133511. The next prime is 221334133571. The reversal of 221334133540 is 45331433122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4425974784 + 216908158756 = 66528^2 + 465734^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425642305 + ... + 425642824.

It is an arithmetic number, because the mean of its divisors is an integer number (20856485685).

Almost surely, 2^221334133540 is an apocalyptic number.

221334133540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221334133540 is an abundant number, since it is smaller than the sum of its proper divisors (279221522900).

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

221334133540 is a wasteful number, since it uses less digits than its factorization.

221334133540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851285151 (or 851285149 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 221334133540 its reverse (45331433122), we get a palindrome (266665566662).

The spelling of 221334133540 in words is "two hundred twenty-one billion, three hundred thirty-four million, one hundred thirty-three thousand, five hundred forty".