221021010019973 has 8 divisors (see below), whose sum is σ = 222304663409400. Its totient is φ = 219737426461888.

The previous prime is 221021010019813. The next prime is 221021010020059. The reversal of 221021010019973 is 379910010120122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 188508012151684 + 32512997868289 = 13729822^2 + 5702017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221021010019973 - 2⁴⁴ = 203428823975557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021010079973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11102618 + ... + 23776251.

It is an arithmetic number, because the mean of its divisors is an integer number (27788082926175).

Almost surely, 2^{221021010019973} is an apocalyptic number.

It is an amenable number.

221021010019973 is a deficient number, since it is larger than the sum of its proper divisors (1283653389427).

221021010019973 is a wasteful number, since it uses less digits than its factorization.

221021010019973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34915671.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 221021010019973 in words is "two hundred twenty-one trillion, twenty-one billion, ten million, nineteen thousand, nine hundred seventy-three".