121221100101 has 8 divisors (see below), whose sum is σ = 161634776704. Its totient is φ = 80810745120.

The previous prime is 121221100069. The next prime is 121221100109. The reversal of 121221100101 is 101001122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221100101 - 2⁵ = 121221100069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221100109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743965 + ... + 892146.

It is an arithmetic number, because the mean of its divisors is an integer number (20204347088).

Almost surely, 2^121221100101 is an apocalyptic number.

It is an amenable number.

121221100101 is a deficient number, since it is larger than the sum of its proper divisors (40413676603).

121221100101 is a wasteful number, since it uses less digits than its factorization.

121221100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660811.

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

Adding to 121221100101 its reverse (101001122121), we get a palindrome (222222222222).

The spelling of 121221100101 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, one hundred one".