21100020010 has 32 divisors (see below), whose sum is σ = 38670219072.
Its totient is φ = 8287655040.
The previous prime is 21100020001. The next prime is 21100020023. The reversal of 21100020010 is 1002000112.
Adding to 21100020010 its reverse (1002000112), we get a palindrome (22102020122).
It is a junction number, because it is equal to n+sod(n) for n = 21100019975 and 21100020002.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102045 + ... + 229375.
It is an arithmetic number, because the mean of its divisors is an integer number (1208444346).
Almost surely, 221100020010 is an apocalyptic number.
21100020010 is a deficient number, since it is larger than the sum of its proper divisors (17570199062).
21100020010 is a wasteful number, since it uses less digits than its factorization.
21100020010 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 127638.
The product of its (nonzero) digits is 4, while the sum is 7.
The spelling of 21100020010 in words is "twenty-one billion, one hundred million, twenty thousand, ten".