120002001021 has 36 divisors (see below), whose sum is σ = 208140426624. Its totient is φ = 66360546000.

The previous prime is 120002000981. The next prime is 120002001023. The reversal of 120002001021 is 120100200021.

It is not a de Polignac number, because 120002001021 - 2¹³ = 120001992829 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 120002000994 and 120002001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120002001023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4375255 + ... + 4402596.

Almost surely, 2^120002001021 is an apocalyptic number.

It is an amenable number.

120002001021 is a deficient number, since it is larger than the sum of its proper divisors (88138425603).

120002001021 is a wasteful number, since it uses less digits than its factorization.

120002001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8777902 (or 8777892 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 120002001021 its reverse (120100200021), we get a palindrome (240102201042).

It can be divided in two parts, 12000 and 2001021, that added together give a triangular number (2013021 = T₂₀₀₆).

The spelling of 120002001021 in words is "one hundred twenty billion, two million, one thousand, twenty-one".