221101221121010 has 64 divisors (see below), whose sum is σ = 419692278337920. Its totient is φ = 83633108129280.

The previous prime is 221101221121003. The next prime is 221101221121021. The reversal of 221101221121010 is 10121122101122.

It is a self number, because there is not a number n which added to its sum of digits gives 221101221121010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284888549 + ... + 285663591.

It is an arithmetic number, because the mean of its divisors is an integer number (6557691849030).

Almost surely, 2^{221101221121010} is an apocalyptic number.

221101221121010 is a deficient number, since it is larger than the sum of its proper divisors (198591057216910).

221101221121010 is a wasteful number, since it uses less digits than its factorization.

221101221121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777803.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221101221121010 its reverse (10121122101122), we get a palindrome (231222343222132).

The spelling of 221101221121010 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twenty-one million, one hundred twenty-one thousand, ten".