120001200021 has 6 divisors (see below), whose sum is σ = 173335066710. Its totient is φ = 80000800008.

The previous prime is 120001200019. The next prime is 120001200097. The reversal of 120001200021 is 120002100021.

It can be written as a sum of positive squares in only one way, i.e., 115389296100 + 4611903921 = 339690^2 + 67911^2 .

It is not a de Polignac number, because 120001200021 - 2¹ = 120001200019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 13333466669 = 120001200021 / (1 + 2 + 0 + 0 + 0 + 1 + 2 + 0 + 0 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 120001199976 and 120001200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120001204021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6666733326 + ... + 6666733343.

It is an arithmetic number, because the mean of its divisors is an integer number (28889177785).

Almost surely, 2^120001200021 is an apocalyptic number.

It is an amenable number.

120001200021 is a deficient number, since it is larger than the sum of its proper divisors (53333866689).

120001200021 is a wasteful number, since it uses less digits than its factorization.

120001200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13333466675 (or 13333466672 counting only the distinct ones).

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

Adding to 120001200021 its reverse (120002100021), we get a palindrome (240003300042).

The spelling of 120001200021 in words is "one hundred twenty billion, one million, two hundred thousand, twenty-one".