21430064 has 20 divisors (see below), whose sum is σ = 43963704. Its totient is φ = 10084608.

The previous prime is 21430063. The next prime is 21430069. The reversal of 21430064 is 46003412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21430063) 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, 39122 + ... + 39665.

Almost surely, 2^21430064 is an apocalyptic number.

It is an amenable number.

21430064 is an abundant number, since it is smaller than the sum of its proper divisors (22533640).

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

21430064 is a wasteful number, since it uses less digits than its factorization.

21430064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78812 (or 78806 counting only the distinct ones).

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

The square root of 21430064 is about 4629.2617121956. The cubic root of 21430064 is about 277.7630608855.

Adding to 21430064 its reverse (46003412), we get a palindrome (67433476).

The spelling of 21430064 in words is "twenty-one million, four hundred thirty thousand, sixty-four".