21430046 has 16 divisors (see below), whose sum is σ = 35160048. Its totient is φ = 9715200.

The previous prime is 21430037. The next prime is 21430063. The reversal of 21430046 is 64003412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9086 + ... + 11198.

It is an arithmetic number, because the mean of its divisors is an integer number (2197503).

Almost surely, 2^21430046 is an apocalyptic number.

21430046 is a deficient number, since it is larger than the sum of its proper divisors (13730002).

21430046 is a wasteful number, since it uses less digits than its factorization.

21430046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587.

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

The square root of 21430046 is about 4629.2597680407. The cubic root of 21430046 is about 277.7629831172.

Adding to 21430046 its reverse (64003412), we get a palindrome (85433458).

The spelling of 21430046 in words is "twenty-one million, four hundred thirty thousand, forty-six".