21375071267 has 16 divisors (see below), whose sum is σ = 24188198400. Its totient is φ = 18710593440.

The previous prime is 21375071251. The next prime is 21375071287. The reversal of 21375071267 is 76217057312.

It is not a de Polignac number, because 21375071267 - 2⁴ = 21375071251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375071287) 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 15 ways as a sum of consecutive naturals, for example, 25784 + ... + 208362.

It is an arithmetic number, because the mean of its divisors is an integer number (1511762400).

Almost surely, 2^21375071267 is an apocalyptic number.

21375071267 is a deficient number, since it is larger than the sum of its proper divisors (2813127133).

21375071267 is a wasteful number, since it uses less digits than its factorization.

21375071267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182986.

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 21375071267 in words is "twenty-one billion, three hundred seventy-five million, seventy-one thousand, two hundred sixty-seven".