21102001192 has 8 divisors (see below), whose sum is σ = 39566252250. Its totient is φ = 10551000592.

The previous prime is 21102001187. The next prime is 21102001229. The reversal of 21102001192 is 29110020112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15859372356 + 5242628836 = 125934^2 + 72406^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318875067 + ... + 1318875082.

Almost surely, 2^21102001192 is an apocalyptic number.

It is an amenable number.

21102001192 is a deficient number, since it is larger than the sum of its proper divisors (18464251058).

21102001192 is a wasteful number, since it uses less digits than its factorization.

21102001192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637750155 (or 2637750151 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21102001192 in words is "twenty-one billion, one hundred two million, one thousand, one hundred ninety-two".