21476137647 has 8 divisors (see below), whose sum is σ = 29120186880. Its totient is φ = 14074756760.

The previous prime is 21476137643. The next prime is 21476137663. The reversal of 21476137647 is 74673167412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21476137647 - 2² = 21476137643 is a prime.

It is a super-2 number, since 2×21476137647² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21476137596 and 21476137605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476137643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60666879 + ... + 60667232.

It is an arithmetic number, because the mean of its divisors is an integer number (3640023360).

Almost surely, 2^21476137647 is an apocalyptic number.

21476137647 is a deficient number, since it is larger than the sum of its proper divisors (7644049233).

21476137647 is a wasteful number, since it uses less digits than its factorization.

21476137647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121334173.

The product of its digits is 1185408, while the sum is 48.

The spelling of 21476137647 in words is "twenty-one billion, four hundred seventy-six million, one hundred thirty-seven thousand, six hundred forty-seven".