2021000120001 has 6 divisors (see below), whose sum is σ = 2919222395570. Its totient is φ = 1347333413328.

The previous prime is 2021000119981. The next prime is 2021000120093. The reversal of 2021000120001 is 1000210001202.

It can be written as a sum of positive squares in only one way, i.e., 1917737510976 + 103262609025 = 1384824^2 + 321345^2 .

It is not a de Polignac number, because 2021000120001 - 2⁶ = 2021000119937 is a prime.

It is a super-3 number, since 3×2021000120001³ (a number of 38 digits) contains 333 as substring.

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: 224555568889 = 2021000120001 / (2 + 0 + 2 + 1 + 0 + 0 + 0 + 1 + 2 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021000120101) 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, 112277784436 + ... + 112277784453.

Almost surely, 2^{2021000120001} is an apocalyptic number.

It is an amenable number.

2021000120001 is a deficient number, since it is larger than the sum of its proper divisors (898222275569).

2021000120001 is a wasteful number, since it uses less digits than its factorization.

2021000120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224555568895 (or 224555568892 counting only the distinct ones).

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

Adding to 2021000120001 its reverse (1000210001202), we get a palindrome (3021210121203).

The spelling of 2021000120001 in words is "two trillion, twenty-one billion, one hundred twenty thousand, one".