21012210110 has 8 divisors (see below), whose sum is σ = 37821978216. Its totient is φ = 8404884040.

The previous prime is 21012210049. The next prime is 21012210113. The reversal of 21012210110 is 1101221012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21012210091 and 21012210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012210113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050610496 + ... + 1050610515.

It is an arithmetic number, because the mean of its divisors is an integer number (4727747277).

Almost surely, 2^21012210110 is an apocalyptic number.

21012210110 is a deficient number, since it is larger than the sum of its proper divisors (16809768106).

21012210110 is a wasteful number, since it uses less digits than its factorization.

21012210110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101221018.

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

Adding to 21012210110 its reverse (1101221012), we get a palindrome (22113431122).

The spelling of 21012210110 in words is "twenty-one billion, twelve million, two hundred ten thousand, one hundred ten".