20011221259 has 2 divisors, whose sum is σ = 20011221260. Its totient is φ = 20011221258.

The previous prime is 20011221257. The next prime is 20011221301. The reversal of 20011221259 is 95212211002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20011221259 - 2¹ = 20011221257 is a prime.

Together with 20011221257, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20011221253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005610629 + 10005610630.

It is an arithmetic number, because the mean of its divisors is an integer number (10005610630).

Almost surely, 2^20011221259 is an apocalyptic number.

20011221259 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011221259 is an equidigital number, since it uses as much as digits as its factorization.

20011221259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 20011221259 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred fifty-nine".