21010110122 has 4 divisors (see below), whose sum is σ = 31515165186. Its totient is φ = 10505055060.

The previous prime is 21010110113. The next prime is 21010110133. The reversal of 21010110122 is 22101101012.

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., 20897304481 + 112805641 = 144559^2 + 10621^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252527529 + ... + 5252527532.

Almost surely, 2^21010110122 is an apocalyptic number.

21010110122 is a deficient number, since it is larger than the sum of its proper divisors (10505055064).

21010110122 is a wasteful number, since it uses less digits than its factorization.

21010110122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505055063.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21010110122 its reverse (22101101012), we get a palindrome (43111211134).

The spelling of 21010110122 in words is "twenty-one billion, ten million, one hundred ten thousand, one hundred twenty-two".