21415052 has 12 divisors (see below), whose sum is σ = 39448920. Its totient is φ = 10143936.

The previous prime is 21415027. The next prime is 21415067. The reversal of 21415052 is 25051412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140813 + ... + 140964.

It is an arithmetic number, because the mean of its divisors is an integer number (3287410).

Almost surely, 2^21415052 is an apocalyptic number.

It is an amenable number.

21415052 is a deficient number, since it is larger than the sum of its proper divisors (18033868).

21415052 is a wasteful number, since it uses less digits than its factorization.

21415052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281800 (or 281798 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 21415052 is about 4627.6400032846. The cubic root of 21415052 is about 277.6981870225.

Adding to 21415052 its reverse (25051412), we get a palindrome (46466464).

The spelling of 21415052 in words is "twenty-one million, four hundred fifteen thousand, fifty-two".