2021231891249 has 2 divisors, whose sum is σ = 2021231891250. Its totient is φ = 2021231891248.

The previous prime is 2021231891233. The next prime is 2021231891309. The reversal of 2021231891249 is 9421981321202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1012549125025 + 1008682766224 = 1006255^2 + 1004332^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021231891249 - 2⁴ = 2021231891233 is a prime.

It is a super-3 number, since 3×2021231891249³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2021231801249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010615945624 + 1010615945625.

It is an arithmetic number, because the mean of its divisors is an integer number (1010615945625).

Almost surely, 2^{2021231891249} is an apocalyptic number.

It is an amenable number.

2021231891249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021231891249 is an equidigital number, since it uses as much as digits as its factorization.

2021231891249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 2021231891249 in words is "two trillion, twenty-one billion, two hundred thirty-one million, eight hundred ninety-one thousand, two hundred forty-nine".