21122012210 has 16 divisors (see below), whose sum is σ = 40944208536. Its totient is φ = 7798896768.

The previous prime is 21122012183. The next prime is 21122012227. The reversal of 21122012210 is 1221022112.

It can be written as a sum of positive squares in 4 ways, for example, as 10269998281 + 10852013929 = 101341^2 + 104173^2 .

It is a super-2 number, since 2×21122012210² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 81238379 + ... + 81238638.

Almost surely, 2^21122012210 is an apocalyptic number.

21122012210 is a deficient number, since it is larger than the sum of its proper divisors (19822196326).

21122012210 is a wasteful number, since it uses less digits than its factorization.

21122012210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162477037.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21122012210 its reverse (1221022112), we get a palindrome (22343034322).

The spelling of 21122012210 in words is "twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred ten".