121021110001 has 4 divisors (see below), whose sum is σ = 132023029104. Its totient is φ = 110019190900.

The previous prime is 121021109987. The next prime is 121021110013. The reversal of 121021110001 is 100011120121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121021110001 - 2⁷ = 121021109873 is a prime.

It is a super-2 number, since 2×121021110001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121021110001.

It is not an unprimeable number, because it can be changed into a prime (121021110101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500959535 + ... + 5500959556.

It is an arithmetic number, because the mean of its divisors is an integer number (33005757276).

Almost surely, 2^121021110001 is an apocalyptic number.

121021110001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121021110001 is a deficient number, since it is larger than the sum of its proper divisors (11001919103).

121021110001 is a wasteful number, since it uses less digits than its factorization.

121021110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11001919102.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121021110001 its reverse (100011120121), we get a palindrome (221032230122).

The spelling of 121021110001 in words is "one hundred twenty-one billion, twenty-one million, one hundred ten thousand, one".