21164472147 has 90 divisors (see below), whose sum is σ = 36069903924. Its totient is φ = 11006442720.

The previous prime is 21164472137. The next prime is 21164472163. The reversal of 21164472147 is 74127446112.

It is a happy number.

It is not a de Polignac number, because 21164472147 - 2⁸ = 21164471891 is a prime.

It is a super-2 number, since 2×21164472147² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21164472127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 298091122 + ... + 298091192.

Almost surely, 2^21164472147 is an apocalyptic number.

21164472147 is a deficient number, since it is larger than the sum of its proper divisors (14905431777).

21164472147 is an frugal number, since it uses more digits than its factorization.

21164472147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 94 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The spelling of 21164472147 in words is "twenty-one billion, one hundred sixty-four million, four hundred seventy-two thousand, one hundred forty-seven".