120021001001001 has 12 divisors (see below), whose sum is σ = 173505420923328. Its totient is φ = 79948576293144.

The previous prime is 120021001000993. The next prime is 120021001001039. The reversal of 120021001001001 is 100100100120021.

It is a happy number.

It is not a de Polignac number, because 120021001001001 - 2³ = 120021001000993 is a prime.

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

120021001001001 is a modest number, since divided by 1001001 gives 120021 as remainder.

It is not an unprimeable number, because it can be changed into a prime (120021001001201) 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, 5452019565 + ... + 5452041578.

It is an arithmetic number, because the mean of its divisors is an integer number (14458785076944).

Almost surely, 2^{120021001001001} is an apocalyptic number.

It is an amenable number.

120021001001001 is a deficient number, since it is larger than the sum of its proper divisors (53484419922327).

120021001001001 is a wasteful number, since it uses less digits than its factorization.

120021001001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10904062372 (or 10904062369 counting only the distinct ones).

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

Adding to 120021001001001 its reverse (100100100120021), we get a palindrome (220121101121022).

The spelling of 120021001001001 in words is "one hundred twenty trillion, twenty-one billion, one million, one thousand, one".