21012121210010 has 32 divisors (see below), whose sum is σ = 44040499880832. Its totient is φ = 7068228373440.

The previous prime is 21012121210007. The next prime is 21012121210049. The reversal of 21012121210010 is 1001212121012.

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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2831818556 + ... + 2831825975.

It is an arithmetic number, because the mean of its divisors is an integer number (1376265621276).

Almost surely, 2^{21012121210010} is an apocalyptic number.

21012121210010 is an abundant number, since it is smaller than the sum of its proper divisors (23028378670822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012121210010 is a wasteful number, since it uses less digits than its factorization.

21012121210010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663644598.

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

Adding to 21012121210010 its reverse (1001212121012), we get a palindrome (22013333331022).

The spelling of 21012121210010 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, two hundred ten thousand, ten".