21221210202202 has 8 divisors (see below), whose sum is σ = 31835009054016. Its totient is φ = 10609540517532.

The previous prime is 21221210202167. The next prime is 21221210202239. The reversal of 21221210202202 is 20220201212212.

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 21221210202202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532266868 + ... + 532306735.

It is an arithmetic number, because the mean of its divisors is an integer number (3979376131752).

Almost surely, 2^{21221210202202} is an apocalyptic number.

21221210202202 is a deficient number, since it is larger than the sum of its proper divisors (10613798851814).

21221210202202 is a wasteful number, since it uses less digits than its factorization.

21221210202202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064583572.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21221210202202 its reverse (20220201212212), we get a palindrome (41441411414414).

The spelling of 21221210202202 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten million, two hundred two thousand, two hundred two".