21222120202101 has 96 divisors (see below), whose sum is σ = 39131543313408. Its totient is φ = 10783703923200.

The previous prime is 21222120202097. The next prime is 21222120202111. The reversal of 21222120202101 is 10120202122212.

It is a happy number.

21222120202101 is a `hidden beast` number, since 21 + 222 + 120 + 202 + 101 = 666.

It is not a de Polignac number, because 21222120202101 - 2² = 21222120202097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222120202111) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 406381 + ... + 6527586.

It is an arithmetic number, because the mean of its divisors is an integer number (407620242848).

Almost surely, 2^{21222120202101} is an apocalyptic number.

21222120202101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21222120202101 is a deficient number, since it is larger than the sum of its proper divisors (17909423111307).

21222120202101 is a wasteful number, since it uses less digits than its factorization.

21222120202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934131 (or 6934128 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120202101 its reverse (10120202122212), we get a palindrome (31342322324313).

The spelling of 21222120202101 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred two thousand, one hundred one".