221035655540 has 24 divisors (see below), whose sum is σ = 530485573632. Its totient is φ = 75783653280.

The previous prime is 221035655513. The next prime is 221035655549. The reversal of 221035655540 is 45556530122.

221035655540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221035655540² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221035655494 and 221035655503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221035655549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789412916 + ... + 789413195.

It is an arithmetic number, because the mean of its divisors is an integer number (22103565568).

Almost surely, 2^221035655540 is an apocalyptic number.

221035655540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221035655540 is an abundant number, since it is smaller than the sum of its proper divisors (309449918092).

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

221035655540 is a wasteful number, since it uses less digits than its factorization.

221035655540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578826127 (or 1578826125 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 221035655540 in words is "two hundred twenty-one billion, thirty-five million, six hundred fifty-five thousand, five hundred forty".