21221202122210 has 16 divisors (see below), whose sum is σ = 38198548489536. Its totient is φ = 8488395366768.

The previous prime is 21221202122149. The next prime is 21221202122257. The reversal of 21221202122210 is 1222120212212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9637712 + ... + 11633051.

It is an arithmetic number, because the mean of its divisors is an integer number (2387409280596).

Almost surely, 2^{21221202122210} is an apocalyptic number.

21221202122210 is a deficient number, since it is larger than the sum of its proper divisors (16977346367326).

21221202122210 is a wasteful number, since it uses less digits than its factorization.

21221202122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21370537.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221202122210 its reverse (1222120212212), we get a palindrome (22443322334422).

The spelling of 21221202122210 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty-two thousand, two hundred ten".