21415064 has 24 divisors (see below), whose sum is σ = 44137380. Its totient is φ = 9733680.

The previous prime is 21415027. The next prime is 21415067. The reversal of 21415064 is 46051412.

It is a super-2 number, since 2×21415064² = 917209932248192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415067) 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, 10094 + ... + 12029.

Almost surely, 2^21415064 is an apocalyptic number.

It is an amenable number.

21415064 is an abundant number, since it is smaller than the sum of its proper divisors (22722316).

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

21415064 is a wasteful number, since it uses less digits than its factorization.

21415064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22151 (or 22136 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21415064 is about 4627.6412998416. The cubic root of 21415064 is about 277.6982388922.

Adding to 21415064 its reverse (46051412), we get a palindrome (67466476).

The spelling of 21415064 in words is "twenty-one million, four hundred fifteen thousand, sixty-four".