21036012 has 24 divisors (see below), whose sum is σ = 49160496. Its totient is φ = 7001088.

The previous prime is 21035981. The next prime is 21036013. The reversal of 21036012 is 21063012.

It is a junction number, because it is equal to n+sod(n) for n = 21035982 and 21036000.

It is not an unprimeable number, because it can be changed into a prime (21036013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11548 + ... + 13244.

It is an arithmetic number, because the mean of its divisors is an integer number (2048354).

Almost surely, 2^21036012 is an apocalyptic number.

It is an amenable number.

21036012 is an abundant number, since it is smaller than the sum of its proper divisors (28124484).

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

21036012 is a wasteful number, since it uses less digits than its factorization.

21036012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737 (or 2735 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21036012 is about 4586.5032432126. The cubic root of 21036012 is about 276.0500329375.

Adding to 21036012 its reverse (21063012), we get a palindrome (42099024).

Subtracting 21036012 from its reverse (21063012), we obtain a cube (27000 = 30³).

The spelling of 21036012 in words is "twenty-one million, thirty-six thousand, twelve".