21121034 has 12 divisors (see below), whose sum is σ = 34823922. Its totient is φ = 9600360.

The previous prime is 21121033. The next prime is 21121063. The reversal of 21121034 is 43012112.

It can be written as a sum of positive squares in only one way, i.e., 12623809 + 8497225 = 3553^2 + 2915^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21121033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43397 + ... + 43880.

Almost surely, 2^21121034 is an apocalyptic number.

21121034 is a deficient number, since it is larger than the sum of its proper divisors (13702888).

21121034 is a wasteful number, since it uses less digits than its factorization.

21121034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87301 (or 87290 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21121034 is about 4595.7626135387. The cubic root of 21121034 is about 276.4214400976.

Adding to 21121034 its reverse (43012112), we get a palindrome (64133146).

The spelling of 21121034 in words is "twenty-one million, one hundred twenty-one thousand, thirty-four".