21506071547364 has 12 divisors (see below), whose sum is σ = 50180833610544. Its totient is φ = 7168690515784.

The previous prime is 21506071547357. The next prime is 21506071547399. The reversal of 21506071547364 is 46374517060512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21506071547364² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896086314462 + ... + 896086314485.

It is an arithmetic number, because the mean of its divisors is an integer number (4181736134212).

Almost surely, 2^{21506071547364} is an apocalyptic number.

It is an amenable number.

21506071547364 is an abundant number, since it is smaller than the sum of its proper divisors (28674762063180).

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

21506071547364 is a wasteful number, since it uses less digits than its factorization.

21506071547364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792172628954 (or 1792172628952 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 21506071547364 in words is "twenty-one trillion, five hundred six billion, seventy-one million, five hundred forty-seven thousand, three hundred sixty-four".