21141229987 has 2 divisors, whose sum is σ = 21141229988. Its totient is φ = 21141229986.

The previous prime is 21141229969. The next prime is 21141230017. The reversal of 21141229987 is 78992214112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21141229987 - 2⁷ = 21141229859 is a prime.

It is not a weakly prime, because it can be changed into another prime (21141221987) 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, 10570614993 + 10570614994.

It is an arithmetic number, because the mean of its divisors is an integer number (10570614994).

Almost surely, 2^21141229987 is an apocalyptic number.

21141229987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141229987 is an equidigital number, since it uses as much as digits as its factorization.

21141229987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The spelling of 21141229987 in words is "twenty-one billion, one hundred forty-one million, two hundred twenty-nine thousand, nine hundred eighty-seven".