21003112213124 has 6 divisors (see below), whose sum is σ = 36755446372974. Its totient is φ = 10501556106560.

The previous prime is 21003112213099. The next prime is 21003112213159. The reversal of 21003112213124 is 42131221130012.

It can be written as a sum of positive squares in only one way, i.e., 11324355668224 + 9678756544900 = 3365168^2 + 3111070^2 .

It is a super-2 number, since 2×21003112213124² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003112213124.

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 as a sum of consecutive naturals, namely, 2625389026637 + ... + 2625389026644.

It is an arithmetic number, because the mean of its divisors is an integer number (6125907728829).

Almost surely, 2^{21003112213124} is an apocalyptic number.

It is an amenable number.

21003112213124 is a deficient number, since it is larger than the sum of its proper divisors (15752334159850).

21003112213124 is a wasteful number, since it uses less digits than its factorization.

21003112213124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250778053285 (or 5250778053283 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21003112213124 its reverse (42131221130012), we get a palindrome (63134333343136).

The spelling of 21003112213124 in words is "twenty-one trillion, three billion, one hundred twelve million, two hundred thirteen thousand, one hundred twenty-four".