21167255919 has 16 divisors (see below), whose sum is σ = 29712711680. Its totient is φ = 13366866240.

The previous prime is 21167255903. The next prime is 21167255939. The reversal of 21167255919 is 91955276112.

It is not a de Polignac number, because 21167255919 - 2⁴ = 21167255903 is a prime.

It is a super-2 number, since 2×21167255919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167255939) 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, 444219 + ... + 489555.

It is an arithmetic number, because the mean of its divisors is an integer number (1857044480).

Almost surely, 2^21167255919 is an apocalyptic number.

21167255919 is a deficient number, since it is larger than the sum of its proper divisors (8545455761).

21167255919 is a wasteful number, since it uses less digits than its factorization.

21167255919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53550.

The product of its digits is 340200, while the sum is 48.

The spelling of 21167255919 in words is "twenty-one billion, one hundred sixty-seven million, two hundred fifty-five thousand, nine hundred nineteen".