21476872241 has 4 divisors (see below), whose sum is σ = 23429315184. Its totient is φ = 19524429300.

The previous prime is 21476872223. The next prime is 21476872247. The reversal of 21476872241 is 14227867412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21476872241 is a prime.

It is a super-2 number, since 2×21476872241² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21476872192 and 21476872201.

It is not an unprimeable number, because it can be changed into a prime (21476872247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976221455 + ... + 976221476.

It is an arithmetic number, because the mean of its divisors is an integer number (5857328796).

Almost surely, 2^21476872241 is an apocalyptic number.

It is an amenable number.

21476872241 is a deficient number, since it is larger than the sum of its proper divisors (1952442943).

21476872241 is a wasteful number, since it uses less digits than its factorization.

21476872241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952442942.

The product of its digits is 301056, while the sum is 44.

The spelling of 21476872241 in words is "twenty-one billion, four hundred seventy-six million, eight hundred seventy-two thousand, two hundred forty-one".