2021868461 has 2 divisors, whose sum is σ = 2021868462. Its totient is φ = 2021868460.

The previous prime is 2021868449. The next prime is 2021868523. The reversal of 2021868461 is 1648681202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1950988900 + 70879561 = 44170^2 + 8419^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021868461 - 2¹⁰ = 2021867437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021838461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010934230 + 1010934231.

It is an arithmetic number, because the mean of its divisors is an integer number (1010934231).

Almost surely, 2^2021868461 is an apocalyptic number.

It is an amenable number.

2021868461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021868461 is an equidigital number, since it uses as much as digits as its factorization.

2021868461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 2021868461 is about 44965.1916597717. The cubic root of 2021868461 is about 1264.4965029001.

The spelling of 2021868461 in words is "two billion, twenty-one million, eight hundred sixty-eight thousand, four hundred sixty-one".