221121021101 has 16 divisors (see below), whose sum is σ = 233575311360. Its totient is φ = 208749668400.

The previous prime is 221121021083. The next prime is 221121021131. The reversal of 221121021101 is 101120121122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221121021101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121021131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6291026 + ... + 6326076.

It is an arithmetic number, because the mean of its divisors is an integer number (14598456960).

Almost surely, 2^221121021101 is an apocalyptic number.

It is an amenable number.

221121021101 is a deficient number, since it is larger than the sum of its proper divisors (12454290259).

221121021101 is a wasteful number, since it uses less digits than its factorization.

221121021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36224.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221121021101 its reverse (101120121122), we get a palindrome (322241142223).

It can be divided in two parts, 221121021 and 101, that added together give a palindrome (221121122).

The spelling of 221121021101 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, one hundred one".