21012022220008 has 8 divisors (see below), whose sum is σ = 39397541662530. Its totient is φ = 10506011110000.

The previous prime is 21012022219957. The next prime is 21012022220009. The reversal of 21012022220008 is 80002222021012.

It can be written as a sum of positive squares in only one way, i.e., 14405076341604 + 6606945878404 = 3795402^2 + 2570398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21012022220009) 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 as a sum of consecutive naturals, namely, 1313251388743 + ... + 1313251388758.

Almost surely, 2^{21012022220008} is an apocalyptic number.

It is an amenable number.

21012022220008 is a deficient number, since it is larger than the sum of its proper divisors (18385519442522).

21012022220008 is a wasteful number, since it uses less digits than its factorization.

21012022220008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626502777507 (or 2626502777503 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The spelling of 21012022220008 in words is "twenty-one trillion, twelve billion, twenty-two million, two hundred twenty thousand, eight".