21253045160189 has 2 divisors, whose sum is σ = 21253045160190. Its totient is φ = 21253045160188.

The previous prime is 21253045160153. The next prime is 21253045160239. The reversal of 21253045160189 is 98106154035212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17698470372025 + 3554574788164 = 4206955^2 + 1885358^2 .

It is a cyclic number.

It is not a de Polignac number, because 21253045160189 - 2¹⁶ = 21253045094653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21253045160489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626522580094 + 10626522580095.

It is an arithmetic number, because the mean of its divisors is an integer number (10626522580095).

Almost surely, 2^{21253045160189} is an apocalyptic number.

It is an amenable number.

21253045160189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21253045160189 is an equidigital number, since it uses as much as digits as its factorization.

21253045160189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 21253045160189 in words is "twenty-one trillion, two hundred fifty-three billion, forty-five million, one hundred sixty thousand, one hundred eighty-nine".