21210122111222 has 24 divisors (see below), whose sum is σ = 35316649647216. Its totient is φ = 9545509490000.

The previous prime is 21210122111177. The next prime is 21210122111231. The reversal of 21210122111222 is 22211122101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210122111194 and 21210122111203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 433862354 + ... + 433911237.

It is an arithmetic number, because the mean of its divisors is an integer number (1471527068634).

Almost surely, 2^{21210122111222} is an apocalyptic number.

21210122111222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210122111222 is a deficient number, since it is larger than the sum of its proper divisors (14106527535994).

21210122111222 is a wasteful number, since it uses less digits than its factorization.

21210122111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867773716 (or 867773705 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21210122111222 its reverse (22211122101212), we get a palindrome (43421244212434).

The spelling of 21210122111222 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-two".