21023223194 has 8 divisors (see below), whose sum is σ = 31562188500. Its totient is φ = 10502493696.

The previous prime is 21023223191. The next prime is 21023223197. The reversal of 21023223194 is 49132232012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21023223191) and next prime (21023223197).

It can be written as a sum of positive squares in 2 ways, for example, as 20826241969 + 196981225 = 144313^2 + 14035^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21023223191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4556069 + ... + 4560680.

Almost surely, 2^21023223194 is an apocalyptic number.

21023223194 is a deficient number, since it is larger than the sum of its proper divisors (10538965306).

21023223194 is a wasteful number, since it uses less digits than its factorization.

21023223194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9117904.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21023223194 in words is "twenty-one billion, twenty-three million, two hundred twenty-three thousand, one hundred ninety-four".