20011219849 has 2 divisors, whose sum is σ = 20011219850. Its totient is φ = 20011219848.

The previous prime is 20011219847. The next prime is 20011219871. The reversal of 20011219849 is 94891211002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14186477449 + 5824742400 = 119107^2 + 76320^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011219849 - 2¹ = 20011219847 is a prime.

Together with 20011219847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20011219847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005609924 + 10005609925.

It is an arithmetic number, because the mean of its divisors is an integer number (10005609925).

Almost surely, 2^20011219849 is an apocalyptic number.

It is an amenable number.

20011219849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011219849 is an equidigital number, since it uses as much as digits as its factorization.

20011219849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

It can be divided in two parts, 200112 and 19849, that added together give a square (219961 = 469²).

The spelling of 20011219849 in words is "twenty billion, eleven million, two hundred nineteen thousand, eight hundred forty-nine".