21981152603 has 2 divisors, whose sum is σ = 21981152604. Its totient is φ = 21981152602.

The previous prime is 21981152587. The next prime is 21981152617. The reversal of 21981152603 is 30625118912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21981152603 - 2⁴ = 21981152587 is a prime.

It is not a weakly prime, because it can be changed into another prime (21981157603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10990576301 + 10990576302.

It is an arithmetic number, because the mean of its divisors is an integer number (10990576302).

Almost surely, 2^21981152603 is an apocalyptic number.

21981152603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21981152603 is an equidigital number, since it uses as much as digits as its factorization.

21981152603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 21981152603 in words is "twenty-one billion, nine hundred eighty-one million, one hundred fifty-two thousand, six hundred three".