121012100001 has 36 divisors (see below), whose sum is σ = 189318916800. Its totient is φ = 74451839904.

The previous prime is 121012099993. The next prime is 121012100017. The reversal of 121012100001 is 100001210121.

It is a happy number.

It is not a de Polignac number, because 121012100001 - 2³ = 121012099993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (121012100021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10761540 + ... + 10772778.

It is an arithmetic number, because the mean of its divisors is an integer number (5258858800).

Almost surely, 2^121012100001 is an apocalyptic number.

It is an amenable number.

121012100001 is a deficient number, since it is larger than the sum of its proper divisors (68306816799).

121012100001 is a wasteful number, since it uses less digits than its factorization.

121012100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18350 (or 18334 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121012100001 its reverse (100001210121), we get a palindrome (221013310122).

The spelling of 121012100001 in words is "one hundred twenty-one billion, twelve million, one hundred thousand, one".