21192396081 has 8 divisors (see below), whose sum is σ = 28257324960. Its totient is φ = 14127865632.

The previous prime is 21192396079. The next prime is 21192396089. The reversal of 21192396081 is 18069329112.

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

It is not a de Polignac number, because 21192396081 - 2¹ = 21192396079 is a prime.

It is a super-2 number, since 2×21192396081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21192396089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61930 + ... + 214988.

It is an arithmetic number, because the mean of its divisors is an integer number (3532165620).

Almost surely, 2^21192396081 is an apocalyptic number.

It is an amenable number.

21192396081 is a deficient number, since it is larger than the sum of its proper divisors (7064928879).

21192396081 is a wasteful number, since it uses less digits than its factorization.

21192396081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199215.

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 21192396081 in words is "twenty-one billion, one hundred ninety-two million, three hundred ninety-six thousand, eighty-one".