21138037367 has 16 divisors (see below), whose sum is σ = 22140754272. Its totient is φ = 20163655680.

The previous prime is 21138037259. The next prime is 21138037373. The reversal of 21138037367 is 76373083112.

It is not a de Polignac number, because 21138037367 - 2¹⁸ = 21137775223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21138031367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298073 + ... + 362109.

It is an arithmetic number, because the mean of its divisors is an integer number (1383797142).

Almost surely, 2^21138037367 is an apocalyptic number.

21138037367 is a deficient number, since it is larger than the sum of its proper divisors (1002716905).

21138037367 is an equidigital number, since it uses as much as digits as its factorization.

21138037367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64258.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 21138037367 in words is "twenty-one billion, one hundred thirty-eight million, thirty-seven thousand, three hundred sixty-seven".