221355415408 has 40 divisors (see below), whose sum is σ = 448171065216. Its totient is φ = 105712305600.

The previous prime is 221355415381. The next prime is 221355415423. The reversal of 221355415408 is 804514553122.

It is a happy number.

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, 180958 + ... + 689533.

Almost surely, 2^221355415408 is an apocalyptic number.

It is an amenable number.

221355415408 is an abundant number, since it is smaller than the sum of its proper divisors (226815649808).

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

221355415408 is a wasteful number, since it uses less digits than its factorization.

221355415408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871213 (or 871207 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 221355415408 in words is "two hundred twenty-one billion, three hundred fifty-five million, four hundred fifteen thousand, four hundred eight".