21106940210 has 16 divisors (see below), whose sum is σ = 39992097600. Its totient is φ = 7998419376.

The previous prime is 21106940171. The next prime is 21106940213. The reversal of 21106940210 is 1204960112.

It is a self number, because there is not a number n which added to its sum of digits gives 21106940210.

It is not an unprimeable number, because it can be changed into a prime (21106940213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55544390 + ... + 55544769.

It is an arithmetic number, because the mean of its divisors is an integer number (2499506100).

Almost surely, 2^21106940210 is an apocalyptic number.

21106940210 is a deficient number, since it is larger than the sum of its proper divisors (18885157390).

21106940210 is a wasteful number, since it uses less digits than its factorization.

21106940210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111089185.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21106940210 in words is "twenty-one billion, one hundred six million, nine hundred forty thousand, two hundred ten".