21013032412 has 24 divisors (see below), whose sum is σ = 37661714496. Its totient is φ = 10253810688.

The previous prime is 21013032389. The next prime is 21013032437. The reversal of 21013032412 is 21423031012.

It is a happy number.

It is a super-2 number, since 2×21013032412² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21013032412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91953 + ... + 224680.

It is an arithmetic number, because the mean of its divisors is an integer number (1569238104).

Almost surely, 2^21013032412 is an apocalyptic number.

It is an amenable number.

21013032412 is a deficient number, since it is larger than the sum of its proper divisors (16648682084).

21013032412 is a wasteful number, since it uses less digits than its factorization.

21013032412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317037 (or 317035 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21013032412 its reverse (21423031012), we get a palindrome (42436063424).

The spelling of 21013032412 in words is "twenty-one billion, thirteen million, thirty-two thousand, four hundred twelve".