21111121202212 has 36 divisors (see below), whose sum is σ = 38263432537876. Its totient is φ = 10191284288640.

The previous prime is 21111121202191. The next prime is 21111121202233. The reversal of 21111121202212 is 21220212111112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21111121202191) and next prime (21111121202233).

It can be written as a sum of positive squares in 6 ways, for example, as 154996540416 + 20956124661796 = 393696^2 + 4577786^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21111121202212.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159996538 + ... + 160128430.

Almost surely, 2^{21111121202212} is an apocalyptic number.

It is an amenable number.

21111121202212 is a deficient number, since it is larger than the sum of its proper divisors (17152311335664).

21111121202212 is a wasteful number, since it uses less digits than its factorization.

21111121202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179536 (or 179505 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21111121202212 its reverse (21220212111112), we get a palindrome (42331333313324).

The spelling of 21111121202212 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred two thousand, two hundred twelve".