221500000078 has 32 divisors (see below), whose sum is σ = 398654516736. Its totient is φ = 90244158048.

The previous prime is 221500000063. The next prime is 221500000097. The reversal of 221500000078 is 870000005122.

221500000078 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221499999998 and 221500000061.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2057601 + ... + 2162572.

It is an arithmetic number, because the mean of its divisors is an integer number (12457953648).

Almost surely, 2^221500000078 is an apocalyptic number.

221500000078 is a deficient number, since it is larger than the sum of its proper divisors (177154516658).

221500000078 is a wasteful number, since it uses less digits than its factorization.

221500000078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220368.

The product of its (nonzero) digits is 1120, while the sum is 25.

The spelling of 221500000078 in words is "two hundred twenty-one billion, five hundred million, seventy-eight", and thus it is an aban number.