21222023194 has 4 divisors (see below), whose sum is σ = 31833034794. Its totient is φ = 10611011596.

The previous prime is 21222023171. The next prime is 21222023201. The reversal of 21222023194 is 49132022212.

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

It can be written as a sum of positive squares in only one way, i.e., 19947890169 + 1274133025 = 141237^2 + 35695^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305505797 + ... + 5305505800.

Almost surely, 2^21222023194 is an apocalyptic number.

21222023194 is a deficient number, since it is larger than the sum of its proper divisors (10611011600).

21222023194 is a wasteful number, since it uses less digits than its factorization.

21222023194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611011599.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21222023194 in words is "twenty-one billion, two hundred twenty-two million, twenty-three thousand, one hundred ninety-four".