21126074 has 4 divisors (see below), whose sum is σ = 31689114. Its totient is φ = 10563036.

The previous prime is 21126059. The next prime is 21126089. The reversal of 21126074 is 47062112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21126059) and next prime (21126089).

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 1456849 = 4435^2 + 1207^2 .

It is a super-2 number, since 2×21126074² = 892622005306952, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281517 + ... + 5281520.

Almost surely, 2^21126074 is an apocalyptic number.

21126074 is a deficient number, since it is larger than the sum of its proper divisors (10563040).

21126074 is a wasteful number, since it uses less digits than its factorization.

21126074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10563039.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21126074 is about 4596.3109120250. The cubic root of 21126074 is about 276.4434253416.

Adding to 21126074 its reverse (47062112), we get a palindrome (68188186).

The spelling of 21126074 in words is "twenty-one million, one hundred twenty-six thousand, seventy-four".