2199531421 has 2 divisors, whose sum is σ = 2199531422. Its totient is φ = 2199531420.

The previous prime is 2199531379. The next prime is 2199531461. The reversal of 2199531421 is 1241359912.

2199531421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1698264100 + 501267321 = 41210^2 + 22389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2199531421 - 2¹¹ = 2199529373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2199531461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099765710 + 1099765711.

It is an arithmetic number, because the mean of its divisors is an integer number (1099765711).

Almost surely, 2^2199531421 is an apocalyptic number.

It is an amenable number.

2199531421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2199531421 is an equidigital number, since it uses as much as digits as its factorization.

2199531421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 2199531421 is about 46899.1622633070. The cubic root of 2199531421 is about 1300.4991024404.

The spelling of 2199531421 in words is "two billion, one hundred ninety-nine million, five hundred thirty-one thousand, four hundred twenty-one".