221121001101 has 128 divisors (see below), whose sum is σ = 411467083776. Its totient is φ = 101919098880.

The previous prime is 221121001099. The next prime is 221121001111. The reversal of 221121001101 is 101100121122.

It is not a de Polignac number, because 221121001101 - 2¹ = 221121001099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121001111) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9210225 + ... + 9234201.

It is an arithmetic number, because the mean of its divisors is an integer number (3214586592).

Almost surely, 2^221121001101 is an apocalyptic number.

221121001101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221121001101 is a deficient number, since it is larger than the sum of its proper divisors (190346082675).

221121001101 is a wasteful number, since it uses less digits than its factorization.

221121001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24131.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221121001101 its reverse (101100121122), we get a palindrome (322221122223).

The spelling of 221121001101 in words is "two hundred twenty-one billion, one hundred twenty-one million, one thousand, one hundred one".