21403046 has 8 divisors (see below), whose sum is σ = 36690960. Its totient is φ = 9172728.

The previous prime is 21403033. The next prime is 21403049. The reversal of 21403046 is 64030412.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764381 + ... + 764408.

It is an arithmetic number, because the mean of its divisors is an integer number (4586370).

Almost surely, 2^21403046 is an apocalyptic number.

21403046 is a deficient number, since it is larger than the sum of its proper divisors (15287914).

21403046 is a wasteful number, since it uses less digits than its factorization.

21403046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528798.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21403046 is about 4626.3426159332. The cubic root of 21403046 is about 277.6462816666.

Adding to 21403046 its reverse (64030412), we get a palindrome (85433458).

The spelling of 21403046 in words is "twenty-one million, four hundred three thousand, forty-six".