21952012 has 24 divisors (see below), whose sum is σ = 39352320. Its totient is φ = 10711440.

The previous prime is 21952003. The next prime is 21952019. The reversal of 21952012 is 21025912.

It is not an unprimeable number, because it can be changed into a prime (21952019) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 44833 + ... + 45319.

It is an arithmetic number, because the mean of its divisors is an integer number (1639680).

Almost surely, 2^21952012 is an apocalyptic number.

It is an amenable number.

21952012 is a deficient number, since it is larger than the sum of its proper divisors (17400308).

21952012 is a wasteful number, since it uses less digits than its factorization.

21952012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21952012 is about 4685.2974291927. The cubic root of 21952012 is about 280.0000510204. Note that the first 4 decimals are identical.

Adding to 21952012 its reverse (21025912), we get a palindrome (42977924).

The spelling of 21952012 in words is "twenty-one million, nine hundred fifty-two thousand, twelve".