210021012105 has 16 divisors (see below), whose sum is σ = 336475206144. Its totient is φ = 111864010880.

The previous prime is 210021012029. The next prime is 210021012107. The reversal of 210021012105 is 501210120012.

It is not a de Polignac number, because 210021012105 - 2¹¹ = 210021010057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (210021012107) 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 in 15 ways as a sum of consecutive naturals, for example, 9187929 + ... + 9210758.

It is an arithmetic number, because the mean of its divisors is an integer number (21029700384).

Almost surely, 2^210021012105 is an apocalyptic number.

It is an amenable number.

210021012105 is a deficient number, since it is larger than the sum of its proper divisors (126454194039).

210021012105 is a wasteful number, since it uses less digits than its factorization.

210021012105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18399456.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 210021012105 its reverse (501210120012), we get a palindrome (711231132117).

The spelling of 210021012105 in words is "two hundred ten billion, twenty-one million, twelve thousand, one hundred five".