21203112884 has 6 divisors (see below), whose sum is σ = 37105447554. Its totient is φ = 10601556440.

The previous prime is 21203112869. The next prime is 21203112893. The reversal of 21203112884 is 48821130212.

It can be written as a sum of positive squares in only one way, i.e., 18558067984 + 2645044900 = 136228^2 + 51430^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21203112884.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650389107 + ... + 2650389114.

It is an arithmetic number, because the mean of its divisors is an integer number (6184241259).

Almost surely, 2^21203112884 is an apocalyptic number.

It is an amenable number.

21203112884 is a deficient number, since it is larger than the sum of its proper divisors (15902334670).

21203112884 is a wasteful number, since it uses less digits than its factorization.

21203112884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300778225 (or 5300778223 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 21203112884 in words is "twenty-one billion, two hundred three million, one hundred twelve thousand, eight hundred eighty-four".