21130412 has 24 divisors (see below), whose sum is σ = 37676352. Its totient is φ = 10368000.

The previous prime is 21130409. The next prime is 21130423. The reversal of 21130412 is 21403112.

It is a super-2 number, since 2×21130412² = 892988622579488, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77837 + ... + 78107.

It is an arithmetic number, because the mean of its divisors is an integer number (1569848).

Almost surely, 2^21130412 is an apocalyptic number.

It is an amenable number.

21130412 is a deficient number, since it is larger than the sum of its proper divisors (16545940).

21130412 is a wasteful number, since it uses less digits than its factorization.

21130412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21130412 is about 4596.7827879942. The cubic root of 21130412 is about 276.4623455553.

Adding to 21130412 its reverse (21403112), we get a palindrome (42533524).

The spelling of 21130412 in words is "twenty-one million, one hundred thirty thousand, four hundred twelve".