21204750212 has 6 divisors (see below), whose sum is σ = 37108312878. Its totient is φ = 10602375104.

The previous prime is 21204750181. The next prime is 21204750223. The reversal of 21204750212 is 21205740212.

It can be written as a sum of positive squares in only one way, i.e., 19094817856 + 2109932356 = 138184^2 + 45934^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650593773 + ... + 2650593780.

It is an arithmetic number, because the mean of its divisors is an integer number (6184718813).

Almost surely, 2^21204750212 is an apocalyptic number.

It is an amenable number.

21204750212 is a deficient number, since it is larger than the sum of its proper divisors (15903562666).

21204750212 is a wasteful number, since it uses less digits than its factorization.

21204750212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5301187557 (or 5301187555 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The spelling of 21204750212 in words is "twenty-one billion, two hundred four million, seven hundred fifty thousand, two hundred twelve".