21102212112202 has 8 divisors (see below), whose sum is σ = 34088188796676. Its totient is φ = 9739482513312.

The previous prime is 21102212112199. The next prime is 21102212112209. The reversal of 21102212112202 is 20221121220112.

It can be written as a sum of positive squares in 2 ways, for example, as 20467670822641 + 634541289561 = 4524121^2 + 796581^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21102212112202.

It is not an unprimeable number, because it can be changed into a prime (21102212112209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405811771363 + ... + 405811771414.

Almost surely, 2^{21102212112202} is an apocalyptic number.

21102212112202 is a deficient number, since it is larger than the sum of its proper divisors (12985976684474).

21102212112202 is a wasteful number, since it uses less digits than its factorization.

21102212112202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811623542792.

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

Adding to 21102212112202 its reverse (20221121220112), we get a palindrome (41323333332314).

The spelling of 21102212112202 in words is "twenty-one trillion, one hundred two billion, two hundred twelve million, one hundred twelve thousand, two hundred two".