21020022122222 has 64 divisors (see below), whose sum is σ = 34328624394240. Its totient is φ = 9625757492736.

The previous prime is 21020022122221. The next prime is 21020022122243. The reversal of 21020022122222 is 22222122002012.

It is a junction number, because it is equal to n+sod(n) for n = 21020022122194 and 21020022122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020022122221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114968963 + ... + 115151649.

It is an arithmetic number, because the mean of its divisors is an integer number (536384756160).

Almost surely, 2^{21020022122222} is an apocalyptic number.

21020022122222 is a deficient number, since it is larger than the sum of its proper divisors (13308602272018).

21020022122222 is a wasteful number, since it uses less digits than its factorization.

21020022122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183825.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21020022122222 its reverse (22222122002012), we get a palindrome (43242144124234).

It can be divided in two parts, 2102002 and 2122222, that added together give a palindrome (4224224).

The spelling of 21020022122222 in words is "twenty-one trillion, twenty billion, twenty-two million, one hundred twenty-two thousand, two hundred twenty-two".