21475342667 has 16 divisors (see below), whose sum is σ = 24020647200. Its totient is φ = 19080069120.

The previous prime is 21475342661. The next prime is 21475342703. The reversal of 21475342667 is 76624357412.

It is a cyclic number.

It is not a de Polignac number, because 21475342667 - 2²⁴ = 21458565451 is a prime.

It is a super-2 number, since 2×21475342667² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21475342661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27542 + ... + 209067.

It is an arithmetic number, because the mean of its divisors is an integer number (1501290450).

Almost surely, 2^21475342667 is an apocalyptic number.

21475342667 is a deficient number, since it is larger than the sum of its proper divisors (2545304533).

21475342667 is a wasteful number, since it uses less digits than its factorization.

21475342667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236926.

The product of its digits is 1693440, while the sum is 47.

The spelling of 21475342667 in words is "twenty-one billion, four hundred seventy-five million, three hundred forty-two thousand, six hundred sixty-seven".