21651052 has 12 divisors (see below), whose sum is σ = 39196080. Its totient is φ = 10452176.

The previous prime is 21651043. The next prime is 21651101. The reversal of 21651052 is 25015612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93208 + ... + 93439.

It is an arithmetic number, because the mean of its divisors is an integer number (3266340).

Almost surely, 2^21651052 is an apocalyptic number.

It is an amenable number.

21651052 is a deficient number, since it is larger than the sum of its proper divisors (17545028).

21651052 is a wasteful number, since it uses less digits than its factorization.

21651052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186680 (or 186678 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 21651052 is about 4653.0690946944. The cubic root of 21651052 is about 278.7145670071.

Adding to 21651052 its reverse (25015612), we get a palindrome (46666664).

The spelling of 21651052 in words is "twenty-one million, six hundred fifty-one thousand, fifty-two".