21051130 has 16 divisors (see below), whose sum is σ = 38373120. Its totient is φ = 8313552.

The previous prime is 21051103. The next prime is 21051137. The reversal of 21051130 is 3115012.

It is a self number, because there is not a number n which added to its sum of digits gives 21051130.

It is not an unprimeable number, because it can be changed into a prime (21051137) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12534 + ... + 14113.

It is an arithmetic number, because the mean of its divisors is an integer number (2398320).

Almost surely, 2^21051130 is an apocalyptic number.

21051130 is a deficient number, since it is larger than the sum of its proper divisors (17321990).

21051130 is a wasteful number, since it uses less digits than its factorization.

21051130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26733.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 21051130 is about 4588.1510437212. The cubic root of 21051130 is about 276.1161469431.

Adding to 21051130 its reverse (3115012), we get a palindrome (24166142).

It can be divided in two parts, 21051 and 130, that multiplied together give a triangular number (2736630 = T₂₃₃₉).

The spelling of 21051130 in words is "twenty-one million, fifty-one thousand, one hundred thirty".