21151016 has 16 divisors (see below), whose sum is σ = 40052340. Its totient is φ = 10470400.

The previous prime is 21150991. The next prime is 21151027. The reversal of 21151016 is 61015112.

It can be written as a sum of positive squares in 2 ways, for example, as 14668900 + 6482116 = 3830^2 + 2546^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21150985 and 21151003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12281 + ... + 13896.

Almost surely, 2^21151016 is an apocalyptic number.

It is an amenable number.

21151016 is a deficient number, since it is larger than the sum of its proper divisors (18901324).

21151016 is a wasteful number, since it uses less digits than its factorization.

21151016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26284 (or 26280 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 21151016 is about 4599.0233745873. The cubic root of 21151016 is about 276.5521746877.

Adding to 21151016 its reverse (61015112), we get a palindrome (82166128).

It can be divided in two parts, 2 and 1151016, that multiplied together give a palindrome (2302032).

The spelling of 21151016 in words is "twenty-one million, one hundred fifty-one thousand, sixteen".