21212000122202 has 4 divisors (see below), whose sum is σ = 31818000183306. Its totient is φ = 10606000061100.

The previous prime is 21212000122169. The next prime is 21212000122249. The reversal of 21212000122202 is 20222100021212.

It is a happy number.

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., 19325000632441 + 1886999489761 = 4396021^2 + 1373681^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303000030549 + ... + 5303000030552.

Almost surely, 2^{21212000122202} is an apocalyptic number.

21212000122202 is a deficient number, since it is larger than the sum of its proper divisors (10606000061104).

21212000122202 is a wasteful number, since it uses less digits than its factorization.

21212000122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606000061103.

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

Adding to 21212000122202 its reverse (20222100021212), we get a palindrome (41434100143414).

The spelling of 21212000122202 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two thousand, two hundred two".