21122112010 has 16 divisors (see below), whose sum is σ = 39330829800. Its totient is φ = 8157505216.

The previous prime is 21122111999. The next prime is 21122112017. The reversal of 21122112010 is 1021122112.

It can be written as a sum of positive squares in 4 ways, for example, as 15752007049 + 5370104961 = 125507^2 + 73281^2 .

It is a super-2 number, since 2×21122112010² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122112017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36417145 + ... + 36417724.

Almost surely, 2^21122112010 is an apocalyptic number.

21122112010 is a deficient number, since it is larger than the sum of its proper divisors (18208717790).

21122112010 is a wasteful number, since it uses less digits than its factorization.

21122112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72834905.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21122112010 its reverse (1021122112), we get a palindrome (22143234122).

The spelling of 21122112010 in words is "twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, ten".