2149826621 has 2 divisors, whose sum is σ = 2149826622. Its totient is φ = 2149826620.

The previous prime is 2149826603. The next prime is 2149826659. The reversal of 2149826621 is 1266289412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1683871225 + 465955396 = 41035^2 + 21586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149826621 - 2⁶ = 2149826557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2149826221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074913310 + 1074913311.

It is an arithmetic number, because the mean of its divisors is an integer number (1074913311).

Almost surely, 2^2149826621 is an apocalyptic number.

It is an amenable number.

2149826621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149826621 is an equidigital number, since it uses as much as digits as its factorization.

2149826621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 2149826621 is about 46366.2228459468. Note that the first 3 decimals coincide. The cubic root of 2149826621 is about 1290.6281861229.

The spelling of 2149826621 in words is "two billion, one hundred forty-nine million, eight hundred twenty-six thousand, six hundred twenty-one".