221021322002078 has 32 divisors (see below), whose sum is σ = 359771097692160. Its totient is φ = 101227988141280.

The previous prime is 221021322002077. The next prime is 221021322002087. The reversal of 221021322002078 is 870200223120122.

It is a super-2 number, since 2×221021322002078² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021322002077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110201843 + ... + 112189521.

It is an arithmetic number, because the mean of its divisors is an integer number (11242846802880).

Almost surely, 2^{221021322002078} is an apocalyptic number.

221021322002078 is a deficient number, since it is larger than the sum of its proper divisors (138749775690082).

221021322002078 is a wasteful number, since it uses less digits than its factorization.

221021322002078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020472.

The product of its (nonzero) digits is 10752, while the sum is 32.

The spelling of 221021322002078 in words is "two hundred twenty-one trillion, twenty-one billion, three hundred twenty-two million, two thousand, seventy-eight".