21231121259 has 2 divisors, whose sum is σ = 21231121260. Its totient is φ = 21231121258.

The previous prime is 21231121243. The next prime is 21231121333. The reversal of 21231121259 is 95212113212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21231121259 - 2⁴ = 21231121243 is a prime.

It is a super-3 number, since 3×21231121259³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21230121259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615560629 + 10615560630.

It is an arithmetic number, because the mean of its divisors is an integer number (10615560630).

Almost surely, 2^21231121259 is an apocalyptic number.

21231121259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231121259 is an equidigital number, since it uses as much as digits as its factorization.

21231121259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The spelling of 21231121259 in words is "twenty-one billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred fifty-nine".