21286298749 has 2 divisors, whose sum is σ = 21286298750. Its totient is φ = 21286298748.

The previous prime is 21286298713. The next prime is 21286298767. The reversal of 21286298749 is 94789268212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20922176025 + 364122724 = 144645^2 + 19082^2 .

It is a cyclic number.

It is not a de Polignac number, because 21286298749 - 2¹¹ = 21286296701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21286298693 and 21286298702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21286298849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10643149374 + 10643149375.

It is an arithmetic number, because the mean of its divisors is an integer number (10643149375).

Almost surely, 2^21286298749 is an apocalyptic number.

It is an amenable number.

21286298749 is a deficient number, since it is larger than the sum of its proper divisors (1).

21286298749 is an equidigital number, since it uses as much as digits as its factorization.

21286298749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 58.

The spelling of 21286298749 in words is "twenty-one billion, two hundred eighty-six million, two hundred ninety-eight thousand, seven hundred forty-nine".