21302012 has 6 divisors (see below), whose sum is σ = 37278528. Its totient is φ = 10651004.

The previous prime is 21301997. The next prime is 21302027. The reversal of 21302012 is 21020312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21301997) and next prime (21302027).

It is a junction number, because it is equal to n+sod(n) for n = 21301984 and 21302002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2662748 + ... + 2662755.

It is an arithmetic number, because the mean of its divisors is an integer number (6213088).

Almost surely, 2^21302012 is an apocalyptic number.

It is an amenable number.

21302012 is a deficient number, since it is larger than the sum of its proper divisors (15976516).

21302012 is a wasteful number, since it uses less digits than its factorization.

21302012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325507 (or 5325505 counting only the distinct ones).

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

The square root of 21302012 is about 4615.4102742876. The cubic root of 21302012 is about 277.2087120122.

Adding to 21302012 its reverse (21020312), we get a palindrome (42322324).

The spelling of 21302012 in words is "twenty-one million, three hundred two thousand, twelve".