21378031183 has 2 divisors, whose sum is σ = 21378031184. Its totient is φ = 21378031182.

The previous prime is 21378031159. The next prime is 21378031219. The reversal of 21378031183 is 38113087312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21378031183 is a prime.

It is a super-2 number, since 2×21378031183² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21378031153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10689015591 + 10689015592.

It is an arithmetic number, because the mean of its divisors is an integer number (10689015592).

Almost surely, 2^21378031183 is an apocalyptic number.

21378031183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21378031183 is an equidigital number, since it uses as much as digits as its factorization.

21378031183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 21378031183 in words is "twenty-one billion, three hundred seventy-eight million, thirty-one thousand, one hundred eighty-three".