21111210196 has 6 divisors (see below), whose sum is σ = 36944617850. Its totient is φ = 10555605096.

The previous prime is 21111210191. The next prime is 21111210209. The reversal of 21111210196 is 69101211112.

It can be written as a sum of positive squares in only one way, i.e., 12987793296 + 8123416900 = 113964^2 + 90130^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21111210196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111210191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638901271 + ... + 2638901278.

Almost surely, 2^21111210196 is an apocalyptic number.

It is an amenable number.

21111210196 is a deficient number, since it is larger than the sum of its proper divisors (15833407654).

21111210196 is a wasteful number, since it uses less digits than its factorization.

21111210196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277802553 (or 5277802551 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 25.

The spelling of 21111210196 in words is "twenty-one billion, one hundred eleven million, two hundred ten thousand, one hundred ninety-six".