21010111202 has 4 divisors (see below), whose sum is σ = 31515166806.
Its totient is φ = 10505055600.
The previous prime is 21010111201. The next prime is 21010111207. The reversal of 21010111202 is 20211101012.
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., 19440446041 + 1569665161 = 139429^2 + 39619^2
It is not an unprimeable number, because it can be changed into a prime (21010111201) by changing a digit.
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, 5252527799 + ... + 5252527802.
Almost surely, 221010111202 is an apocalyptic number.
21010111202 is a deficient number, since it is larger than the sum of its proper divisors (10505055604).
21010111202 is a wasteful number, since it uses less digits than its factorization.
21010111202 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10505055603.
The product of its (nonzero) digits is 8, while the sum is 11.
Adding to 21010111202 its reverse (20211101012), we get a palindrome (41221212214).
The spelling of 21010111202 in words is "twenty-one billion, ten million, one hundred eleven thousand, two hundred two".