21210110112122 has 4 divisors (see below), whose sum is σ = 31815165168186. Its totient is φ = 10605055056060.

The previous prime is 21210110112101. The next prime is 21210110112133. The reversal of 21210110112122 is 22121101101212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12954607761001 + 8255502351121 = 3599251^2 + 2873239^2 .

It is a super-2 number, since 2×21210110112122² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21210110112122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302527528029 + ... + 5302527528032.

Almost surely, 2^{21210110112122} is an apocalyptic number.

21210110112122 is a deficient number, since it is larger than the sum of its proper divisors (10605055056064).

21210110112122 is a wasteful number, since it uses less digits than its factorization.

21210110112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605055056063.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21210110112122 its reverse (22121101101212), we get a palindrome (43331211213334).

The spelling of 21210110112122 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, one hundred twelve thousand, one hundred twenty-two".