21476526647421 has 32 divisors (see below), whose sum is σ = 30177849945600. Its totient is φ = 13548217809600.

The previous prime is 21476526647371. The next prime is 21476526647423. The reversal of 21476526647421 is 12474662567412.

It is a happy number.

It is not a de Polignac number, because 21476526647421 - 2¹¹ = 21476526645373 is a prime.

It is a super-2 number, since 2×21476526647421² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476526647423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271173190 + ... + 271252376.

It is an arithmetic number, because the mean of its divisors is an integer number (943057810800).

Almost surely, 2^{21476526647421} is an apocalyptic number.

It is an amenable number.

21476526647421 is a deficient number, since it is larger than the sum of its proper divisors (8701323298179).

21476526647421 is a wasteful number, since it uses less digits than its factorization.

21476526647421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84729.

The product of its digits is 27095040, while the sum is 57.

The spelling of 21476526647421 in words is "twenty-one trillion, four hundred seventy-six billion, five hundred twenty-six million, six hundred forty-seven thousand, four hundred twenty-one".