21012046 has 8 divisors (see below), whose sum is σ = 34383384. Its totient is φ = 9550920.

The previous prime is 21011981. The next prime is 21012053. The reversal of 21012046 is 64021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21012046² = 883012154212232, which contains 22 as substring.

It is a congruent number.

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, 477525 + ... + 477568.

It is an arithmetic number, because the mean of its divisors is an integer number (4297923).

Almost surely, 2^21012046 is an apocalyptic number.

21012046 is a deficient number, since it is larger than the sum of its proper divisors (13371338).

21012046 is a wasteful number, since it uses less digits than its factorization.

21012046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955106.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21012046 is about 4583.8898328821. The cubic root of 21012046 is about 275.9451599367.

Adding to 21012046 its reverse (64021012), we get a palindrome (85033058).

The spelling of 21012046 in words is "twenty-one million, twelve thousand, forty-six".