21047474012 has 12 divisors (see below), whose sum is σ = 37616762400. Its totient is φ = 10299827616.

The previous prime is 21047473987. The next prime is 21047474017.

21047474012 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21047474012² (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 21047474012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21047474017) 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, 55977137 + ... + 55977512.

It is an arithmetic number, because the mean of its divisors is an integer number (3134730200).

Almost surely, 2^21047474012 is an apocalyptic number.

It is an amenable number.

21047474012 is a deficient number, since it is larger than the sum of its proper divisors (16569288388).

21047474012 is a wasteful number, since it uses less digits than its factorization.

21047474012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111954700 (or 111954698 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The spelling of 21047474012 in words is "twenty-one billion, forty-seven million, four hundred seventy-four thousand, twelve".