21242552205 has 16 divisors (see below), whose sum is σ = 38843524224. Its totient is φ = 9710880960.

The previous prime is 21242552203. The next prime is 21242552209. The reversal of 21242552205 is 50225524212.

It is not a de Polignac number, because 21242552205 - 2¹ = 21242552203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242552203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101154906 + ... + 101155115.

It is an arithmetic number, because the mean of its divisors is an integer number (2427720264).

Almost surely, 2^21242552205 is an apocalyptic number.

It is an amenable number.

21242552205 is a deficient number, since it is larger than the sum of its proper divisors (17600972019).

21242552205 is a wasteful number, since it uses less digits than its factorization.

21242552205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202310036.

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 21242552205 in words is "twenty-one billion, two hundred forty-two million, five hundred fifty-two thousand, two hundred five".