120001002021 has 12 divisors (see below), whose sum is σ = 173337783372. Its totient is φ = 79999282176.

The previous prime is 120001002019. The next prime is 120001002031. The reversal of 120001002021 is 120200100021.

It can be written as a sum of positive squares in 2 ways, for example, as 82016940996 + 37984061025 = 286386^2 + 194895^2 .

It is not a de Polignac number, because 120001002021 - 2¹ = 120001002019 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 = 120001001994 and 120001002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120001002031) 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, 963115 + ... + 1080551.

It is an arithmetic number, because the mean of its divisors is an integer number (14444815281).

Almost surely, 2^120001002021 is an apocalyptic number.

It is an amenable number.

120001002021 is a deficient number, since it is larger than the sum of its proper divisors (53336781351).

120001002021 is a wasteful number, since it uses less digits than its factorization.

120001002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230980 (or 230977 counting only the distinct ones).

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

Adding to 120001002021 its reverse (120200100021), we get a palindrome (240201102042).

The spelling of 120001002021 in words is "one hundred twenty billion, one million, two thousand, twenty-one".