120121100001 has 12 divisors (see below), whose sum is σ = 198295149312. Its totient is φ = 68640628536.

The previous prime is 120121099963. The next prime is 120121100023. The reversal of 120121100001 is 100001121021.

It is a happy number.

It is not a de Polignac number, because 120121100001 - 2⁷ = 120121099873 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 (120121100051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 953342001 + ... + 953342126.

It is an arithmetic number, because the mean of its divisors is an integer number (16524595776).

Almost surely, 2^120121100001 is an apocalyptic number.

It is an amenable number.

120121100001 is a deficient number, since it is larger than the sum of its proper divisors (78174049311).

120121100001 is a wasteful number, since it uses less digits than its factorization.

120121100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906684140 (or 1906684137 counting only the distinct ones).

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

Adding to 120121100001 its reverse (100001121021), we get a palindrome (220122221022).

The spelling of 120121100001 in words is "one hundred twenty billion, one hundred twenty-one million, one hundred thousand, one".