21042478867267 has 24 divisors (see below), whose sum is σ = 24938856759600. Its totient is φ = 17636515195200.

The previous prime is 21042478867261. The next prime is 21042478867271. The reversal of 21042478867267 is 76276887424012.

It is a happy number.

It is not a de Polignac number, because 21042478867267 - 2³¹ = 21040331383619 is a prime.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21042478867199 and 21042478867208.

It is not an unprimeable number, because it can be changed into a prime (21042478867261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6855517 + ... + 9438382.

It is an arithmetic number, because the mean of its divisors is an integer number (1039119031650).

Almost surely, 2^{21042478867267} is an apocalyptic number.

21042478867267 is a deficient number, since it is larger than the sum of its proper divisors (3896377892333).

21042478867267 is a wasteful number, since it uses less digits than its factorization.

21042478867267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16294755 (or 16294744 counting only the distinct ones).

The product of its (nonzero) digits is 101154816, while the sum is 64.

The spelling of 21042478867267 in words is "twenty-one trillion, forty-two billion, four hundred seventy-eight million, eight hundred sixty-seven thousand, two hundred sixty-seven".