21221434210 has 64 divisors (see below), whose sum is σ = 40768012800. Its totient is φ = 7930656000.

The previous prime is 21221434187. The next prime is 21221434277. The reversal of 21221434210 is 1243412212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5160055 + ... + 5164165.

It is an arithmetic number, because the mean of its divisors is an integer number (637000200).

Almost surely, 2^21221434210 is an apocalyptic number.

21221434210 is a deficient number, since it is larger than the sum of its proper divisors (19546578590).

21221434210 is a wasteful number, since it uses less digits than its factorization.

21221434210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4507.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21221434210 its reverse (1243412212), we get a palindrome (22464846422).

The spelling of 21221434210 in words is "twenty-one billion, two hundred twenty-one million, four hundred thirty-four thousand, two hundred ten".