221640313551740 has 24 divisors (see below), whose sum is σ = 476796967203312. Its totient is φ = 86493780897920.

The previous prime is 221640313551739. The next prime is 221640313551773. The reversal of 221640313551740 is 47155313046122.

It is a junction number, because it is equal to n+sod(n) for n = 221640313551691 and 221640313551700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135146531834 + ... + 135146533473.

It is an arithmetic number, because the mean of its divisors is an integer number (19866540300138).

Almost surely, 2^{221640313551740} is an apocalyptic number.

221640313551740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221640313551740 is an abundant number, since it is smaller than the sum of its proper divisors (255156653651572).

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

221640313551740 is a wasteful number, since it uses less digits than its factorization.

221640313551740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270293065357 (or 270293065355 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

Adding to 221640313551740 its reverse (47155313046122), we get a palindrome (268795626597862).

The spelling of 221640313551740 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred thirteen million, five hundred fifty-one thousand, seven hundred forty".