21262152 has 16 divisors (see below), whose sum is σ = 53155440. Its totient is φ = 7087376.

The previous prime is 21262147. The next prime is 21262183. The reversal of 21262152 is 25126212.

It is a happy number.

It is a super-2 number, since 2×21262152² = 904158215342208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442938 + ... + 442985.

It is an arithmetic number, because the mean of its divisors is an integer number (3322215).

Almost surely, 2^21262152 is an apocalyptic number.

It is an amenable number.

21262152 is an abundant number, since it is smaller than the sum of its proper divisors (31893288).

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

21262152 is a wasteful number, since it uses less digits than its factorization.

21262152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885932 (or 885928 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 21262152 is about 4611.0901097246. The cubic root of 21262152 is about 277.0357011507.

Adding to 21262152 its reverse (25126212), we get a palindrome (46388364).

It can be divided in two parts, 2126 and 2152, that added together give a triangular number (4278 = T₉₂).

The spelling of 21262152 in words is "twenty-one million, two hundred sixty-two thousand, one hundred fifty-two".