21122222122210 has 32 divisors (see below), whose sum is σ = 41751041376384. Its totient is φ = 7629941760000.

The previous prime is 21122222122153. The next prime is 21122222122213. The reversal of 21122222122210 is 1222122222112.

It is a super-2 number, since 2×21122222122210² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21122222122213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635811871 + ... + 635845090.

It is an arithmetic number, because the mean of its divisors is an integer number (1304720043012).

Almost surely, 2^{21122222122210} is an apocalyptic number.

21122222122210 is a deficient number, since it is larger than the sum of its proper divisors (20628819254174).

21122222122210 is a wasteful number, since it uses less digits than its factorization.

21122222122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271657130.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21122222122210 its reverse (1222122222112), we get a palindrome (22344344344322).

The spelling of 21122222122210 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred ten".