21020012122010 has 64 divisors (see below), whose sum is σ = 42396843533184. Its totient is φ = 7436069049600.

The previous prime is 21020012121989. The next prime is 21020012122037. The reversal of 21020012122010 is 1022121002012.

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, 30678629 + ... + 31356311.

It is an arithmetic number, because the mean of its divisors is an integer number (662450680206).

Almost surely, 2^{21020012122010} is an apocalyptic number.

21020012122010 is an abundant number, since it is smaller than the sum of its proper divisors (21376831411174).

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

21020012122010 is a wasteful number, since it uses less digits than its factorization.

21020012122010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685359.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020012122010 its reverse (1022121002012), we get a palindrome (22042133124022).

The spelling of 21020012122010 in words is "twenty-one trillion, twenty billion, twelve million, one hundred twenty-two thousand, ten".