21210120010 has 16 divisors (see below), whose sum is σ = 38195097696. Its totient is φ = 8480296528.

The previous prime is 21210119977. The next prime is 21210120011. The reversal of 21210120010 is 1002101212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21210120011) 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, 445132 + ... + 490471.

It is an arithmetic number, because the mean of its divisors is an integer number (2387193606).

Almost surely, 2^21210120010 is an apocalyptic number.

21210120010 is a deficient number, since it is larger than the sum of its proper divisors (16984977686).

21210120010 is a wasteful number, since it uses less digits than its factorization.

21210120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937877.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21210120010 its reverse (1002101212), we get a palindrome (22212221222).

The spelling of 21210120010 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, ten".