2021881031 has 2 divisors, whose sum is σ = 2021881032. Its totient is φ = 2021881030.

The previous prime is 2021881019. The next prime is 2021881061. The reversal of 2021881031 is 1301881202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021881031 - 2¹⁸ = 2021618887 is a prime.

It is a super-2 number, since 2×2021881031² = 8176005807035245922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021881061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010940515 + 1010940516.

It is an arithmetic number, because the mean of its divisors is an integer number (1010940516).

Almost surely, 2^2021881031 is an apocalyptic number.

2021881031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021881031 is an equidigital number, since it uses as much as digits as its factorization.

2021881031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 2021881031 is about 44965.3314343395. The cubic root of 2021881031 is about 1264.4991233620.

The spelling of 2021881031 in words is "two billion, twenty-one million, eight hundred eighty-one thousand, thirty-one".