21994237695 has 32 divisors (see below), whose sum is σ = 35389509120. Its totient is φ = 11664176000.

The previous prime is 21994237691. The next prime is 21994237717. The reversal of 21994237695 is 59673249912.

It is not a de Polignac number, because 21994237695 - 2² = 21994237691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994237691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2431441 + ... + 2440469.

It is an arithmetic number, because the mean of its divisors is an integer number (1105922160).

Almost surely, 2^21994237695 is an apocalyptic number.

21994237695 is a deficient number, since it is larger than the sum of its proper divisors (13395271425).

21994237695 is a wasteful number, since it uses less digits than its factorization.

21994237695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9935.

The product of its digits is 7348320, while the sum is 57.

The spelling of 21994237695 in words is "twenty-one billion, nine hundred ninety-four million, two hundred thirty-seven thousand, six hundred ninety-five".