21153426665403 has 16 divisors (see below), whose sum is σ = 28474508940320. Its totient is φ = 13967952574464.

The previous prime is 21153426665369. The next prime is 21153426665429. The reversal of 21153426665403 is 30456662435112.

It is not a de Polignac number, because 21153426665403 - 2⁹ = 21153426664891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21153426665003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79636876 + ... + 79902057.

It is an arithmetic number, because the mean of its divisors is an integer number (1779656808770).

Almost surely, 2^{21153426665403} is an apocalyptic number.

21153426665403 is a deficient number, since it is larger than the sum of its proper divisors (7321082274917).

21153426665403 is a wasteful number, since it uses less digits than its factorization.

21153426665403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159539358.

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 21153426665403 in words is "twenty-one trillion, one hundred fifty-three billion, four hundred twenty-six million, six hundred sixty-five thousand, four hundred three".