21242552206 has 16 divisors (see below), whose sum is σ = 33091496064. Its totient is φ = 10219427064.

The previous prime is 21242552203. The next prime is 21242552209. The reversal of 21242552206 is 60225524212.

It is an interprime number because it is at equal distance from previous prime (21242552203) and next prime (21242552209).

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 7 ways as a sum of consecutive naturals, for example, 1837570 + ... + 1849093.

It is an arithmetic number, because the mean of its divisors is an integer number (2068218504).

Almost surely, 2^21242552206 is an apocalyptic number.

21242552206 is a deficient number, since it is larger than the sum of its proper divisors (11848943858).

21242552206 is a wasteful number, since it uses less digits than its factorization.

21242552206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686775.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 21242552206 in words is "twenty-one billion, two hundred forty-two million, five hundred fifty-two thousand, two hundred six".