21721722223063 has 8 divisors (see below), whose sum is σ = 22521200140800. Its totient is φ = 20928417880440.

The previous prime is 21721722223051. The next prime is 21721722223081. The reversal of 21721722223063 is 36032222712712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21721722223063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21721722224063) 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, 1543386613 + ... + 1543400686.

It is an arithmetic number, because the mean of its divisors is an integer number (2815150017600).

Almost surely, 2^{21721722223063} is an apocalyptic number.

21721722223063 is a deficient number, since it is larger than the sum of its proper divisors (799477917737).

21721722223063 is a wasteful number, since it uses less digits than its factorization.

21721722223063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086787557.

The product of its (nonzero) digits is 169344, while the sum is 40.

Adding to 21721722223063 its reverse (36032222712712), we get a palindrome (57753944935775).

The spelling of 21721722223063 in words is "twenty-one trillion, seven hundred twenty-one billion, seven hundred twenty-two million, two hundred twenty-three thousand, sixty-three".