21051046 has 16 divisors (see below), whose sum is σ = 32744448. Its totient is φ = 10139400.

The previous prime is 21051029. The next prime is 21051047. The reversal of 21051046 is 64015012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051047) by changing a digit.

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, 15661 + ... + 16951.

It is an arithmetic number, because the mean of its divisors is an integer number (2046528).

Almost surely, 2^21051046 is an apocalyptic number.

21051046 is a deficient number, since it is larger than the sum of its proper divisors (11693402).

21051046 is a wasteful number, since it uses less digits than its factorization.

21051046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21051046 is about 4588.1418896978. The cubic root of 21051046 is about 276.1157796820.

Adding to 21051046 its reverse (64015012), we get a palindrome (85066058).

The spelling of 21051046 in words is "twenty-one million, fifty-one thousand, forty-six".