21220202001212 has 6 divisors (see below), whose sum is σ = 37135353502128. Its totient is φ = 10610101000604.

The previous prime is 21220202001161. The next prime is 21220202001253. The reversal of 21220202001212 is 21210020202212.

It is a happy number.

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, 2652525250148 + ... + 2652525250155.

It is an arithmetic number, because the mean of its divisors is an integer number (6189225583688).

Almost surely, 2^{21220202001212} is an apocalyptic number.

It is an amenable number.

21220202001212 is a deficient number, since it is larger than the sum of its proper divisors (15915151500916).

21220202001212 is a wasteful number, since it uses less digits than its factorization.

21220202001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305050500307 (or 5305050500305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220202001212 its reverse (21210020202212), we get a palindrome (42430222203424).

The spelling of 21220202001212 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, one thousand, two hundred twelve".