21112012122202 has 4 divisors (see below), whose sum is σ = 31668018183306. Its totient is φ = 10556006061100.

The previous prime is 21112012122151. The next prime is 21112012122209. The reversal of 21112012122202 is 20222121021112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12380820412321 + 8731191709881 = 3518639^2 + 2954859^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21112012122202.

It is not an unprimeable number, because it can be changed into a prime (21112012122209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278003030549 + ... + 5278003030552.

Almost surely, 2^{21112012122202} is an apocalyptic number.

21112012122202 is a deficient number, since it is larger than the sum of its proper divisors (10556006061104).

21112012122202 is a wasteful number, since it uses less digits than its factorization.

21112012122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556006061103.

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

Adding to 21112012122202 its reverse (20222121021112), we get a palindrome (41334133143314).

The spelling of 21112012122202 in words is "twenty-one trillion, one hundred twelve billion, twelve million, one hundred twenty-two thousand, two hundred two".