21124100479 has 2 divisors, whose sum is σ = 21124100480. Its totient is φ = 21124100478.

The previous prime is 21124100443. The next prime is 21124100489. The reversal of 21124100479 is 97400142112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21124100479 - 2¹¹ = 21124098431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21124100479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124100489) 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, 10562050239 + 10562050240.

It is an arithmetic number, because the mean of its divisors is an integer number (10562050240).

Almost surely, 2^21124100479 is an apocalyptic number.

21124100479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124100479 is an equidigital number, since it uses as much as digits as its factorization.

21124100479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 21124100479 in words is "twenty-one billion, one hundred twenty-four million, one hundred thousand, four hundred seventy-nine".