2381578021 has 2 divisors, whose sum is σ = 2381578022. Its totient is φ = 2381578020.

The previous prime is 2381577953. The next prime is 2381578027. The reversal of 2381578021 is 1208751832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2291536900 + 90041121 = 47870^2 + 9489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2381578021 - 2²⁷ = 2247360293 is a prime.

It is a super-2 number, since 2×2381578021² = 11343827740220552882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2381578027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1190789010 + 1190789011.

It is an arithmetic number, because the mean of its divisors is an integer number (1190789011).

Almost surely, 2^2381578021 is an apocalyptic number.

It is an amenable number.

2381578021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2381578021 is an equidigital number, since it uses as much as digits as its factorization.

2381578021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 2381578021 is about 48801.4141291008. The cubic root of 2381578021 is about 1335.4314644789.

The spelling of 2381578021 in words is "two billion, three hundred eighty-one million, five hundred seventy-eight thousand, twenty-one".