221064435120 has 40 divisors (see below), whose sum is σ = 685299749616. Its totient is φ = 58950515968.

The previous prime is 221064435101. The next prime is 221064435143. The reversal of 221064435120 is 21534460122.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 460550667 + ... + 460551146.

Almost surely, 2^221064435120 is an apocalyptic number.

221064435120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221064435120 is an abundant number, since it is smaller than the sum of its proper divisors (464235314496).

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

221064435120 is a wasteful number, since it uses less digits than its factorization.

221064435120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921101829 (or 921101823 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 221064435120 its reverse (21534460122), we get a palindrome (242598895242).

The spelling of 221064435120 in words is "two hundred twenty-one billion, sixty-four million, four hundred thirty-five thousand, one hundred twenty".