21212212202 has 8 divisors (see below), whose sum is σ = 31818945312. Its totient is φ = 10605897100.

The previous prime is 21212212201. The next prime is 21212212243. The reversal of 21212212202 is 20221221212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21212212201) 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, 112427 + ... + 234657.

It is an arithmetic number, because the mean of its divisors is an integer number (3977368164).

Almost surely, 2^21212212202 is an apocalyptic number.

21212212202 is a deficient number, since it is larger than the sum of its proper divisors (10606733110).

21212212202 is a wasteful number, since it uses less digits than its factorization.

21212212202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209004.

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

Adding to 21212212202 its reverse (20221221212), we get a palindrome (41433433414).

The spelling of 21212212202 in words is "twenty-one billion, two hundred twelve million, two hundred twelve thousand, two hundred two".