2153745421 has 2 divisors, whose sum is σ = 2153745422. Its totient is φ = 2153745420.

The previous prime is 2153745413. The next prime is 2153745449. The reversal of 2153745421 is 1245473512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1637092521 + 516652900 = 40461^2 + 22730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153745421 - 2³ = 2153745413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2153745401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076872710 + 1076872711.

It is an arithmetic number, because the mean of its divisors is an integer number (1076872711).

Almost surely, 2^2153745421 is an apocalyptic number.

It is an amenable number.

2153745421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153745421 is an equidigital number, since it uses as much as digits as its factorization.

2153745421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 34.

The square root of 2153745421 is about 46408.4628166027. The cubic root of 2153745421 is about 1291.4119150141.

The spelling of 2153745421 in words is "two billion, one hundred fifty-three million, seven hundred forty-five thousand, four hundred twenty-one".