21051514 has 16 divisors (see below), whose sum is σ = 34681536. Its totient is φ = 9504000.

The previous prime is 21051493. The next prime is 21051523. The reversal of 21051514 is 41515012.

It is a junction number, because it is equal to n+sod(n) for n = 21051491 and 21051500.

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 7 ways as a sum of consecutive naturals, for example, 154 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (2167596).

Almost surely, 2^21051514 is an apocalyptic number.

21051514 is a deficient number, since it is larger than the sum of its proper divisors (13630022).

21051514 is a wasteful number, since it uses less digits than its factorization.

21051514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6501.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 21051514 is about 4588.1928904526. The cubic root of 21051514 is about 276.1178258388.

Adding to 21051514 its reverse (41515012), we get a palindrome (62566526).

The spelling of 21051514 in words is "twenty-one million, fifty-one thousand, five hundred fourteen".