221973353634 has 32 divisors (see below), whose sum is σ = 467570799360. Its totient is φ = 70058077200.

The previous prime is 221973353597. The next prime is 221973353647. The reversal of 221973353634 is 436353379122.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 331132 + ... + 744039.

It is an arithmetic number, because the mean of its divisors is an integer number (14611587480).

Almost surely, 2^221973353634 is an apocalyptic number.

221973353634 is an abundant number, since it is smaller than the sum of its proper divisors (245597445726).

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

221973353634 is a wasteful number, since it uses less digits than its factorization.

221973353634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077006.

The product of its digits is 2449440, while the sum is 48.

The spelling of 221973353634 in words is "two hundred twenty-one billion, nine hundred seventy-three million, three hundred fifty-three thousand, six hundred thirty-four".