21001032412 has 6 divisors (see below), whose sum is σ = 36751806728. Its totient is φ = 10500516204.

The previous prime is 21001032397. The next prime is 21001032413. The reversal of 21001032412 is 21423010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001032413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625129048 + ... + 2625129055.

Almost surely, 2^21001032412 is an apocalyptic number.

It is an amenable number.

21001032412 is a deficient number, since it is larger than the sum of its proper divisors (15750774316).

21001032412 is a wasteful number, since it uses less digits than its factorization.

21001032412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250258107 (or 5250258105 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21001032412 its reverse (21423010012), we get a palindrome (42424042424).

The spelling of 21001032412 in words is "twenty-one billion, one million, thirty-two thousand, four hundred twelve".