21263046 has 16 divisors (see below), whose sum is σ = 48601344. Its totient is φ = 6075144.

The previous prime is 21263041. The next prime is 21263057. The reversal of 21263046 is 64036212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263041) 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, 253090 + ... + 253173.

It is an arithmetic number, because the mean of its divisors is an integer number (3037584).

Almost surely, 2^21263046 is an apocalyptic number.

21263046 is an abundant number, since it is smaller than the sum of its proper divisors (27338298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21263046 is a wasteful number, since it uses less digits than its factorization.

21263046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506275.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21263046 is about 4611.1870489062. The cubic root of 21263046 is about 277.0395838942.

Adding to 21263046 its reverse (64036212), we get a palindrome (85299258).

The spelling of 21263046 in words is "twenty-one million, two hundred sixty-three thousand, forty-six".