21302412 has 12 divisors (see below), whose sum is σ = 49705656. Its totient is φ = 7100800.

The previous prime is 21302399. The next prime is 21302419. The reversal of 21302412 is 21420312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21302391 and 21302400.

It is not an unprimeable number, because it can be changed into a prime (21302419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887589 + ... + 887612.

It is an arithmetic number, because the mean of its divisors is an integer number (4142138).

Almost surely, 2^21302412 is an apocalyptic number.

It is an amenable number.

21302412 is an abundant number, since it is smaller than the sum of its proper divisors (28403244).

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

21302412 is a wasteful number, since it uses less digits than its factorization.

21302412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775208 (or 1775206 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21302412 is about 4615.4536071767. The cubic root of 21302412 is about 277.2104471033.

Adding to 21302412 its reverse (21420312), we get a palindrome (42722724).

The spelling of 21302412 in words is "twenty-one million, three hundred two thousand, four hundred twelve".