21192192001 has 4 divisors (see below), whose sum is σ = 21204681732. Its totient is φ = 21179702272.

The previous prime is 21192191903. The next prime is 21192192017. The reversal of 21192192001 is 10029129112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10722809601 + 10469382400 = 103551^2 + 102320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21192192001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21192192601) 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, 6242320 + ... + 6245713.

It is an arithmetic number, because the mean of its divisors is an integer number (5301170433).

Almost surely, 2^21192192001 is an apocalyptic number.

It is an amenable number.

21192192001 is a deficient number, since it is larger than the sum of its proper divisors (12489731).

21192192001 is a wasteful number, since it uses less digits than its factorization.

21192192001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12489730.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 21192192001 in words is "twenty-one billion, one hundred ninety-two million, one hundred ninety-two thousand, one".