21051126 has 24 divisors (see below), whose sum is σ = 48012120. Its totient is φ = 6647616.

The previous prime is 21051103. The next prime is 21051137. The reversal of 21051126 is 62115012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21051099 and 21051108.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 30435 + ... + 31118.

It is an arithmetic number, because the mean of its divisors is an integer number (2000505).

Almost surely, 2^21051126 is an apocalyptic number.

21051126 is an abundant number, since it is smaller than the sum of its proper divisors (26960994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21051126 is a wasteful number, since it uses less digits than its factorization.

21051126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61580 (or 61577 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 21051126 is about 4588.1506078157. The cubic root of 21051126 is about 276.1161294545.

Adding to 21051126 its reverse (62115012), we get a palindrome (83166138).

The spelling of 21051126 in words is "twenty-one million, fifty-one thousand, one hundred twenty-six".