21014064 has 30 divisors (see below), whose sum is σ = 58810596. Its totient is φ = 7004640.

The previous prime is 21014047. The next prime is 21014069. The reversal of 21014064 is 46041012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21014069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72822 + ... + 73109.

Almost surely, 2^21014064 is an apocalyptic number.

21014064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21014064 is an abundant number, since it is smaller than the sum of its proper divisors (37796532).

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

21014064 is a wasteful number, since it uses less digits than its factorization.

21014064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145945 (or 145936 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21014064 is about 4584.1099463255. The cubic root of 21014064 is about 275.9539935919.

Adding to 21014064 its reverse (46041012), we get a palindrome (67055076).

The spelling of 21014064 in words is "twenty-one million, fourteen thousand, sixty-four".