21451046 has 16 divisors (see below), whose sum is σ = 33217776. Its totient is φ = 10381536.

The previous prime is 21451033. The next prime is 21451063. The reversal of 21451046 is 64015412.

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 7 ways as a sum of consecutive naturals, for example, 16160 + ... + 17436.

It is an arithmetic number, because the mean of its divisors is an integer number (2076111).

Almost surely, 2^21451046 is an apocalyptic number.

21451046 is a deficient number, since it is larger than the sum of its proper divisors (11766730).

21451046 is a wasteful number, since it uses less digits than its factorization.

21451046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21451046 is about 4631.5273938518. The cubic root of 21451046 is about 277.8536831614.

Adding to 21451046 its reverse (64015412), we get a palindrome (85466458).

It can be divided in two parts, 2 and 1451046, that multiplied together give a palindrome (2902092).

The spelling of 21451046 in words is "twenty-one million, four hundred fifty-one thousand, forty-six".