21202211201212 has 6 divisors (see below), whose sum is σ = 37103869602128. Its totient is φ = 10601105600604.

The previous prime is 21202211201207. The next prime is 21202211201239. The reversal of 21202211201212 is 21210211220212.

It is a self number, because there is not a number n which added to its sum of digits gives 21202211201212.

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 as a sum of consecutive naturals, namely, 2650276400148 + ... + 2650276400155.

Almost surely, 2^{21202211201212} is an apocalyptic number.

It is an amenable number.

21202211201212 is a deficient number, since it is larger than the sum of its proper divisors (15901658400916).

21202211201212 is a wasteful number, since it uses less digits than its factorization.

21202211201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300552800307 (or 5300552800305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21202211201212 its reverse (21210211220212), we get a palindrome (42412422421424).

The spelling of 21202211201212 in words is "twenty-one trillion, two hundred two billion, two hundred eleven million, two hundred one thousand, two hundred twelve".