21121022221210 has 16 divisors (see below), whose sum is σ = 38585270447136. Its totient is φ = 8322313233168.

The previous prime is 21121022221199. The next prime is 21121022221217. The reversal of 21121022221210 is 1212222012112.

It is not an unprimeable number, because it can be changed into a prime (21121022221217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15761956212 + ... + 15761957551.

It is an arithmetic number, because the mean of its divisors is an integer number (2411579402946).

Almost surely, 2^{21121022221210} is an apocalyptic number.

21121022221210 is a deficient number, since it is larger than the sum of its proper divisors (17464248225926).

21121022221210 is a wasteful number, since it uses less digits than its factorization.

21121022221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31523913837.

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

Adding to 21121022221210 its reverse (1212222012112), we get a palindrome (22333244233322).

The spelling of 21121022221210 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, two hundred ten".