21201120212 has 6 divisors (see below), whose sum is σ = 37101960378. Its totient is φ = 10600560104.

The previous prime is 21201120203. The next prime is 21201120221. The reversal of 21201120212 is 21202110212.

It is an interprime number because it is at equal distance from previous prime (21201120203) and next prime (21201120221).

It can be written as a sum of positive squares in only one way, i.e., 19973038276 + 1228081936 = 141326^2 + 35044^2 .

It is a congruent number.

It is an unprimeable number.

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, 2650140023 + ... + 2650140030.

It is an arithmetic number, because the mean of its divisors is an integer number (6183660063).

Almost surely, 2^21201120212 is an apocalyptic number.

It is an amenable number.

21201120212 is a deficient number, since it is larger than the sum of its proper divisors (15900840166).

21201120212 is a wasteful number, since it uses less digits than its factorization.

21201120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300280057 (or 5300280055 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21201120212 its reverse (21202110212), we get a palindrome (42403230424).

The spelling of 21201120212 in words is "twenty-one billion, two hundred one million, one hundred twenty thousand, two hundred twelve".