21447074412 has 36 divisors (see below), whose sum is σ = 54249741000. Its totient is φ = 7144237632.

The previous prime is 21447074401. The next prime is 21447074419.

21447074412 is a `hidden beast` number, since 2 + 144 + 70 + 7 + 441 + 2 = 666.

21447074412 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21447074419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144753 + ... + 252680.

It is an arithmetic number, because the mean of its divisors is an integer number (1506937250).

Almost surely, 2^21447074412 is an apocalyptic number.

It is an amenable number.

21447074412 is an abundant number, since it is smaller than the sum of its proper divisors (32802666588).

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

21447074412 is a wasteful number, since it uses less digits than its factorization.

21447074412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398942 (or 398937 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

It can be divided in two parts, 214470 and 74412, that added together give a palindrome (288882).

The spelling of 21447074412 in words is "twenty-one billion, four hundred forty-seven million, seventy-four thousand, four hundred twelve".