21021110102122 has 8 divisors (see below), whose sum is σ = 33957177857316. Its totient is φ = 9702050816352.

The previous prime is 21021110101949. The next prime is 21021110102123. The reversal of 21021110102122 is 22120101112012.

It can be written as a sum of positive squares in 2 ways, for example, as 20948663534841 + 72446567281 = 4576971^2 + 269159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21021110102096 and 21021110102105.

It is not an unprimeable number, because it can be changed into a prime (21021110102123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404252117323 + ... + 404252117374.

Almost surely, 2^{21021110102122} is an apocalyptic number.

21021110102122 is a deficient number, since it is larger than the sum of its proper divisors (12936067755194).

21021110102122 is a wasteful number, since it uses less digits than its factorization.

21021110102122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808504234712.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021110102122 its reverse (22120101112012), we get a palindrome (43141211214134).

The spelling of 21021110102122 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, one hundred two thousand, one hundred twenty-two".