21371194547 has 32 divisors (see below), whose sum is σ = 24675840000. Its totient is φ = 18372082176.

The previous prime is 21371194541. The next prime is 21371194553. The reversal of 21371194547 is 74549117312.

It is an interprime number because it is at equal distance from previous prime (21371194541) and next prime (21371194553).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21371194547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21371194498 and 21371194507.

It is not an unprimeable number, because it can be changed into a prime (21371194541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9543854 + ... + 9546092.

It is an arithmetic number, because the mean of its divisors is an integer number (771120000).

Almost surely, 2^21371194547 is an apocalyptic number.

21371194547 is a deficient number, since it is larger than the sum of its proper divisors (3304645453).

21371194547 is a wasteful number, since it uses less digits than its factorization.

21371194547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323.

The product of its digits is 211680, while the sum is 44.

The spelling of 21371194547 in words is "twenty-one billion, three hundred seventy-one million, one hundred ninety-four thousand, five hundred forty-seven".