21447620615412 has 72 divisors (see below), whose sum is σ = 54304599533184. Its totient is φ = 7137371678976.

The previous prime is 21447620615363. The next prime is 21447620615413. The reversal of 21447620615412 is 21451602674412.

21447620615412 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 7 + 6 + 20 + 615 + 4 + 1 + 2 = 666.

It is a super-2 number, since 2×21447620615412² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447620615413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132522213 + ... + 132683955.

It is an arithmetic number, because the mean of its divisors is an integer number (754230549072).

Almost surely, 2^{21447620615412} is an apocalyptic number.

It is an amenable number.

21447620615412 is an abundant number, since it is smaller than the sum of its proper divisors (32856978917772).

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

21447620615412 is a wasteful number, since it uses less digits than its factorization.

21447620615412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167829 (or 167824 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 21447620615412 in words is "twenty-one trillion, four hundred forty-seven billion, six hundred twenty million, six hundred fifteen thousand, four hundred twelve".