19961022238 has 4 divisors (see below), whose sum is σ = 29941533360. Its totient is φ = 9980511118.

The previous prime is 19961022229. The next prime is 19961022269. The reversal of 19961022238 is 83222016991.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 19961022194 and 19961022203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990255558 + ... + 4990255561.

It is an arithmetic number, because the mean of its divisors is an integer number (7485383340).

Almost surely, 2^19961022238 is an apocalyptic number.

19961022238 is a deficient number, since it is larger than the sum of its proper divisors (9980511122).

19961022238 is an equidigital number, since it uses as much as digits as its factorization.

19961022238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9980511121.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 19961022238 in words is "nineteen billion, nine hundred sixty-one million, twenty-two thousand, two hundred thirty-eight".