21124554514 has 16 divisors (see below), whose sum is σ = 36228201408. Its totient is φ = 9049710672.

The previous prime is 21124554463. The next prime is 21124554551. The reversal of 21124554514 is 41545542112.

It is a self number, because there is not a number n which added to its sum of digits gives 21124554514.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 269904 + ... + 339259.

It is an arithmetic number, because the mean of its divisors is an integer number (2264262588).

Almost surely, 2^21124554514 is an apocalyptic number.

21124554514 is a deficient number, since it is larger than the sum of its proper divisors (15103646894).

21124554514 is a wasteful number, since it uses less digits than its factorization.

21124554514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611649.

The product of its digits is 32000, while the sum is 34.

The spelling of 21124554514 in words is "twenty-one billion, one hundred twenty-four million, five hundred fifty-four thousand, five hundred fourteen".