21210303194 has 8 divisors (see below), whose sum is σ = 31885074228. Its totient is φ = 10581945120.

The previous prime is 21210303161. The next prime is 21210303197. The reversal of 21210303194 is 49130301212.

It can be written as a sum of positive squares in 2 ways, for example, as 21154248025 + 56055169 = 145445^2 + 7487^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21210303197) 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, 11602097 + ... + 11603924.

Almost surely, 2^21210303194 is an apocalyptic number.

21210303194 is a deficient number, since it is larger than the sum of its proper divisors (10674771034).

21210303194 is a wasteful number, since it uses less digits than its factorization.

21210303194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23206480.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21210303194 in words is "twenty-one billion, two hundred ten million, three hundred three thousand, one hundred ninety-four".