2021000031 has 8 divisors (see below), whose sum is σ = 2994074160. Its totient is φ = 1347333336.

The previous prime is 2021000029. The next prime is 2021000083. The reversal of 2021000031 is 1300001202.

It is a happy number.

It is not a de Polignac number, because 2021000031 - 2¹ = 2021000029 is a prime.

It is a super-2 number, since 2×2021000031² = 8168882250604001922, which contains 22 as substring.

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 = 2020999977 and 2021000022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021000131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37425900 + ... + 37425953.

It is an arithmetic number, because the mean of its divisors is an integer number (374259270).

Almost surely, 2^2021000031 is an apocalyptic number.

2021000031 is a deficient number, since it is larger than the sum of its proper divisors (973074129).

2021000031 is an equidigital number, since it uses as much as digits as its factorization.

2021000031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74851862 (or 74851856 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2021000031 is about 44955.5339307632. The cubic root of 2021000031 is about 1264.3154354075.

Adding to 2021000031 its reverse (1300001202), we get a palindrome (3321001233).

The spelling of 2021000031 in words is "two billion, twenty-one million, thirty-one", and thus it is an aban number and an uban number.