221959405374366 has 16 divisors (see below), whose sum is σ = 484275066271488. Its totient is φ = 67260425871000.

The previous prime is 221959405374299. The next prime is 221959405374389. The reversal of 221959405374366 is 663473504959122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 3363021293551 = 221959405374366 / (2 + 2 + 1 + 9 + 5 + 9 + 4 + 0 + 5 + 3 + 7 + 4 + 3 + 6 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 221959405374297 and 221959405374306.

It is a congruent number.

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, 1681510646710 + ... + 1681510646841.

It is an arithmetic number, because the mean of its divisors is an integer number (30267191641968).

Almost surely, 2^{221959405374366} is an apocalyptic number.

221959405374366 is an abundant number, since it is smaller than the sum of its proper divisors (262315660897122).

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

221959405374366 is a wasteful number, since it uses less digits than its factorization.

221959405374366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363021293567.

The product of its (nonzero) digits is 293932800, while the sum is 66.

The spelling of 221959405374366 in words is "two hundred twenty-one trillion, nine hundred fifty-nine billion, four hundred five million, three hundred seventy-four thousand, three hundred sixty-six".