2154621043 has 2 divisors, whose sum is σ = 2154621044. Its totient is φ = 2154621042.

The previous prime is 2154621019. The next prime is 2154621083. The reversal of 2154621043 is 3401264512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154621043 - 2⁵ = 2154621011 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154621083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077310521 + 1077310522.

It is an arithmetic number, because the mean of its divisors is an integer number (1077310522).

Almost surely, 2^2154621043 is an apocalyptic number.

2154621043 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154621043 is an equidigital number, since it uses as much as digits as its factorization.

2154621043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 2154621043 is about 46417.8957192159. The cubic root of 2154621043 is about 1291.5869024977.

Adding to 2154621043 its reverse (3401264512), we get a palindrome (5555885555).

The spelling of 2154621043 in words is "two billion, one hundred fifty-four million, six hundred twenty-one thousand, forty-three".