21210121121222 has 32 divisors (see below), whose sum is σ = 34759451635200. Its totient is φ = 9626533469280.

The previous prime is 21210121121221. The next prime is 21210121121243. The reversal of 21210121121222 is 22212112101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210121121194 and 21210121121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210121121221) 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, 50654243 + ... + 51071249.

It is an arithmetic number, because the mean of its divisors is an integer number (1086232863600).

Almost surely, 2^{21210121121222} is an apocalyptic number.

21210121121222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210121121222 is a deficient number, since it is larger than the sum of its proper divisors (13549330513978).

21210121121222 is a wasteful number, since it uses less digits than its factorization.

21210121121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420476.

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

Adding to 21210121121222 its reverse (22212112101212), we get a palindrome (43422233222434).

The spelling of 21210121121222 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".