201221101010 has 16 divisors (see below), whose sum is σ = 362394115776. Its totient is φ = 80444855088.

The previous prime is 201221101007. The next prime is 201221101031. The reversal of 201221101010 is 10101122102.

It is a junction number, because it is equal to n+sod(n) for n = 201221100982 and 201221101000.

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, 5428772 + ... + 5465711.

It is an arithmetic number, because the mean of its divisors is an integer number (22649632236).

Almost surely, 2^201221101010 is an apocalyptic number.

201221101010 is a deficient number, since it is larger than the sum of its proper divisors (161173014766).

201221101010 is a wasteful number, since it uses less digits than its factorization.

201221101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10896337.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201221101010 its reverse (10101122102), we get a palindrome (211322223112).

The spelling of 201221101010 in words is "two hundred one billion, two hundred twenty-one million, one hundred one thousand, ten".