21122652205 has 16 divisors (see below), whose sum is σ = 25423372800. Its totient is φ = 16847396800.

The previous prime is 21122652119. The next prime is 21122652217. The reversal of 21122652205 is 50225622112.

It is a de Polignac number, because none of the positive numbers 2^k-21122652205 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3112506 + ... + 3119284.

It is an arithmetic number, because the mean of its divisors is an integer number (1588960800).

Almost surely, 2^21122652205 is an apocalyptic number.

It is an amenable number.

21122652205 is a deficient number, since it is larger than the sum of its proper divisors (4300720595).

21122652205 is a wasteful number, since it uses less digits than its factorization.

21122652205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8564.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21122652205 in words is "twenty-one billion, one hundred twenty-two million, six hundred fifty-two thousand, two hundred five".