21122993995 has 4 divisors (see below), whose sum is σ = 25347592800. Its totient is φ = 16898395192.

The previous prime is 21122993977. The next prime is 21122994007. The reversal of 21122993995 is 59939922112.

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

It is a cyclic number.

It is not a de Polignac number, because 21122993995 - 2¹³ = 21122985803 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112299395 + ... + 2112299404.

It is an arithmetic number, because the mean of its divisors is an integer number (6336898200).

Almost surely, 2^21122993995 is an apocalyptic number.

21122993995 is a deficient number, since it is larger than the sum of its proper divisors (4224598805).

21122993995 is an equidigital number, since it uses as much as digits as its factorization.

21122993995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224598804.

The product of its digits is 787320, while the sum is 52.

The spelling of 21122993995 in words is "twenty-one billion, one hundred twenty-two million, nine hundred ninety-three thousand, nine hundred ninety-five".