21430054 has 16 divisors (see below), whose sum is σ = 32670000. Its totient is φ = 10541664.

The previous prime is 21430037. The next prime is 21430063. The reversal of 21430054 is 45003412.

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, 42697 + ... + 43195.

It is an arithmetic number, because the mean of its divisors is an integer number (2041875).

Almost surely, 2^21430054 is an apocalyptic number.

21430054 is a deficient number, since it is larger than the sum of its proper divisors (11239946).

21430054 is a wasteful number, since it uses less digits than its factorization.

21430054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21430054 is about 4629.2606321096. The cubic root of 21430054 is about 277.7630176809.

Adding to 21430054 its reverse (45003412), we get a palindrome (66433466).

The spelling of 21430054 in words is "twenty-one million, four hundred thirty thousand, fifty-four".