21010121212010 has 64 divisors (see below), whose sum is σ = 43309477440000. Its totient is φ = 7188696490752.

The previous prime is 21010121211979. The next prime is 21010121212049. The reversal of 21010121212010 is 1021212101012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 632380259 + ... + 632413481.

It is an arithmetic number, because the mean of its divisors is an integer number (676710585000).

Almost surely, 2^{21010121212010} is an apocalyptic number.

21010121212010 is an abundant number, since it is smaller than the sum of its proper divisors (22299356227990).

21010121212010 is a wasteful number, since it uses less digits than its factorization.

21010121212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51495.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21010121212010 its reverse (1021212101012), we get a palindrome (22031333313022).

The spelling of 21010121212010 in words is "twenty-one trillion, ten billion, one hundred twenty-one million, two hundred twelve thousand, ten".