21725694993 has 16 divisors (see below), whose sum is σ = 29064033536. Its totient is φ = 14435625600.

The previous prime is 21725694983. The next prime is 21725694997. The reversal of 21725694993 is 39949652712.

It is not a de Polignac number, because 21725694993 - 2⁵ = 21725694961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21725694997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2189343 + ... + 2199243.

It is an arithmetic number, because the mean of its divisors is an integer number (1816502096).

Almost surely, 2^21725694993 is an apocalyptic number.

It is an amenable number.

21725694993 is a deficient number, since it is larger than the sum of its proper divisors (7338338543).

21725694993 is a wasteful number, since it uses less digits than its factorization.

21725694993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12264.

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

The spelling of 21725694993 in words is "twenty-one billion, seven hundred twenty-five million, six hundred ninety-four thousand, nine hundred ninety-three".