21163124477 has 16 divisors (see below), whose sum is σ = 24129403200. Its totient is φ = 18384253440.

The previous prime is 21163124467. The next prime is 21163124519. The reversal of 21163124477 is 77442136112.

It is a cyclic number.

It is not a de Polignac number, because 21163124477 - 2⁸ = 21163124221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21163124477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163124467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311027 + ... + 372912.

It is an arithmetic number, because the mean of its divisors is an integer number (1508087700).

Almost surely, 2^21163124477 is an apocalyptic number.

It is an amenable number.

21163124477 is a deficient number, since it is larger than the sum of its proper divisors (2966278723).

21163124477 is a wasteful number, since it uses less digits than its factorization.

21163124477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684076.

The product of its digits is 56448, while the sum is 38.

The spelling of 21163124477 in words is "twenty-one billion, one hundred sixty-three million, one hundred twenty-four thousand, four hundred seventy-seven".