221806402026 has 16 divisors (see below), whose sum is σ = 483941240928. Its totient is φ = 67214061200.

The previous prime is 221806401997. The next prime is 221806402039. The reversal of 221806402026 is 620204608122.

221806402026 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 (33).

It is an unprimeable number.

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, 1680351465 + ... + 1680351596.

It is an arithmetic number, because the mean of its divisors is an integer number (30246327558).

Almost surely, 2^221806402026 is an apocalyptic number.

221806402026 is an abundant number, since it is smaller than the sum of its proper divisors (262134838902).

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

221806402026 is a wasteful number, since it uses less digits than its factorization.

221806402026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360703077.

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 221806402026 in words is "two hundred twenty-one billion, eight hundred six million, four hundred two thousand, twenty-six".