221552435412 has 120 divisors (see below), whose sum is σ = 722096907840. Its totient is φ = 57546080640.

The previous prime is 221552435411. The next prime is 221552435471. The reversal of 221552435412 is 214534255122.

221552435412 is a `hidden beast` number, since 2 + 2 + 1 + 552 + 43 + 54 + 12 = 666.

221552435412 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221552435411) 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 39 ways as a sum of consecutive naturals, for example, 4415337 + ... + 4465232.

It is an arithmetic number, because the mean of its divisors is an integer number (6017474232).

Almost surely, 2^221552435412 is an apocalyptic number.

221552435412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221552435412 is an abundant number, since it is smaller than the sum of its proper divisors (500544472428).

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

221552435412 is a wasteful number, since it uses less digits than its factorization.

221552435412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880603 (or 8880592 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The spelling of 221552435412 in words is "two hundred twenty-one billion, five hundred fifty-two million, four hundred thirty-five thousand, four hundred twelve".