21712225005 has 24 divisors (see below), whose sum is σ = 38848542720. Its totient is φ = 11206308960.

The previous prime is 21712224991. The next prime is 21712225013. The reversal of 21712225005 is 50052221712.

It is not a de Polignac number, because 21712225005 - 2⁵ = 21712224973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21712225005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7780765 + ... + 7783554.

It is an arithmetic number, because the mean of its divisors is an integer number (1618689280).

Almost surely, 2^21712225005 is an apocalyptic number.

It is an amenable number.

21712225005 is a deficient number, since it is larger than the sum of its proper divisors (17136317715).

21712225005 is a wasteful number, since it uses less digits than its factorization.

21712225005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15564361 (or 15564358 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

Adding to 21712225005 its reverse (50052221712), we get a palindrome (71764446717).

The spelling of 21712225005 in words is "twenty-one billion, seven hundred twelve million, two hundred twenty-five thousand, five".