221121320235 has 96 divisors (see below), whose sum is σ = 374172718080. Its totient is φ = 111492412416.

The previous prime is 221121320209. The next prime is 221121320291. The reversal of 221121320235 is 532023121122.

It is not a de Polignac number, because 221121320235 - 2⁹ = 221121319723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 477583614 + ... + 477584076.

It is an arithmetic number, because the mean of its divisors is an integer number (3897632480).

Almost surely, 2^221121320235 is an apocalyptic number.

221121320235 is a deficient number, since it is larger than the sum of its proper divisors (153051397845).

221121320235 is a wasteful number, since it uses less digits than its factorization.

221121320235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 221121320235 its reverse (532023121122), we get a palindrome (753144441357).

The spelling of 221121320235 in words is "two hundred twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, two hundred thirty-five".