21000413412 has 72 divisors (see below), whose sum is σ = 61316734752. Its totient is φ = 5989420800.

The previous prime is 21000413411. The next prime is 21000413477. The reversal of 21000413412 is 21431400012.

21000413412 is a `hidden beast` number, since 210 + 0 + 0 + 41 + 3 + 412 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21000413411) 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 in 23 ways as a sum of consecutive naturals, for example, 1553014 + ... + 1566477.

It is an arithmetic number, because the mean of its divisors is an integer number (851621316).

Almost surely, 2^21000413412 is an apocalyptic number.

21000413412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000413412 is an abundant number, since it is smaller than the sum of its proper divisors (40316321340).

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

21000413412 is a wasteful number, since it uses less digits than its factorization.

21000413412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119529 (or 3119524 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21000413412 its reverse (21431400012), we get a palindrome (42431813424).

The spelling of 21000413412 in words is "twenty-one billion, four hundred thirteen thousand, four hundred twelve".