21212075404708 has 6 divisors (see below), whose sum is σ = 37121131958246. Its totient is φ = 10606037702352.

The previous prime is 21212075404693. The next prime is 21212075404717. The reversal of 21212075404708 is 80740457021212.

It can be written as a sum of positive squares in only one way, i.e., 20620517524324 + 591557880384 = 4540982^2 + 769128^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651509425585 + ... + 2651509425592.

Almost surely, 2^{21212075404708} is an apocalyptic number.

It is an amenable number.

21212075404708 is a deficient number, since it is larger than the sum of its proper divisors (15909056553538).

21212075404708 is a wasteful number, since it uses less digits than its factorization.

21212075404708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303018851181 (or 5303018851179 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 43.

The spelling of 21212075404708 in words is "twenty-one trillion, two hundred twelve billion, seventy-five million, four hundred four thousand, seven hundred eight".