19211085644 has 6 divisors (see below), whose sum is σ = 33619399884. Its totient is φ = 9605542820.

The previous prime is 19211085643. The next prime is 19211085653. The reversal of 19211085644 is 44658011291.

It is a super-2 number, since 2×19211085644² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19211085643) 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, 2401385702 + ... + 2401385709.

It is an arithmetic number, because the mean of its divisors is an integer number (5603233314).

Almost surely, 2^19211085644 is an apocalyptic number.

It is an amenable number.

19211085644 is a deficient number, since it is larger than the sum of its proper divisors (14408314240).

19211085644 is a wasteful number, since it uses less digits than its factorization.

19211085644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4802771415 (or 4802771413 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 19211085644 in words is "nineteen billion, two hundred eleven million, eighty-five thousand, six hundred forty-four".