21442401187 has 2 divisors, whose sum is σ = 21442401188. Its totient is φ = 21442401186.

The previous prime is 21442401163. The next prime is 21442401247. The reversal of 21442401187 is 78110424412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21442401187 - 2⁷ = 21442401059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442411187) 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 as a sum of consecutive naturals, namely, 10721200593 + 10721200594.

It is an arithmetic number, because the mean of its divisors is an integer number (10721200594).

Almost surely, 2^21442401187 is an apocalyptic number.

21442401187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442401187 is an equidigital number, since it uses as much as digits as its factorization.

21442401187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 34.

Adding to 21442401187 its reverse (78110424412), we get a palindrome (99552825599).

The spelling of 21442401187 in words is "twenty-one billion, four hundred forty-two million, four hundred one thousand, one hundred eighty-seven".