21310220212 has 12 divisors (see below), whose sum is σ = 37302404580. Its totient is φ = 10652390336.

The previous prime is 21310220159. The next prime is 21310220221. The reversal of 21310220212 is 21202201312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2586129316 + 18724090896 = 50854^2 + 136836^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662263 + ... + 693694.

It is an arithmetic number, because the mean of its divisors is an integer number (3108533715).

Almost surely, 2^21310220212 is an apocalyptic number.

It is an amenable number.

21310220212 is a deficient number, since it is larger than the sum of its proper divisors (15992184368).

21310220212 is a wasteful number, since it uses less digits than its factorization.

21310220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359890 (or 1359888 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21310220212 its reverse (21202201312), we get a palindrome (42512421524).

The spelling of 21310220212 in words is "twenty-one billion, three hundred ten million, two hundred twenty thousand, two hundred twelve".