21032012 has 48 divisors (see below), whose sum is σ = 40857600. Its totient is φ = 9434880.

The previous prime is 21032003. The next prime is 21032023. The reversal of 21032012 is 21023012.

It is a happy number.

It is a super-4 number, since 4×21032012⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21031984 and 21032002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186068 + ... + 186180.

It is an arithmetic number, because the mean of its divisors is an integer number (851200).

Almost surely, 2^21032012 is an apocalyptic number.

It is an amenable number.

21032012 is a deficient number, since it is larger than the sum of its proper divisors (19825588).

21032012 is a wasteful number, since it uses less digits than its factorization.

21032012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21032012 is about 4586.0671604328. The cubic root of 21032012 is about 276.0325348470.

Adding to 21032012 its reverse (21023012), we get a palindrome (42055024).

The spelling of 21032012 in words is "twenty-one million, thirty-two thousand, twelve".