21210112002 has 16 divisors (see below), whose sum is σ = 42468384672. Its totient is φ = 7062010560.

The previous prime is 21210111997. The next prime is 21210112003. The reversal of 21210112002 is 20021101212.

It is a super-2 number, since 2×21210112002² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210112003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2000968 + ... + 2011539.

It is an arithmetic number, because the mean of its divisors is an integer number (2654274042).

Almost surely, 2^21210112002 is an apocalyptic number.

21210112002 is an abundant number, since it is smaller than the sum of its proper divisors (21258272670).

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

21210112002 is a wasteful number, since it uses less digits than its factorization.

21210112002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013393.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210112002 its reverse (20021101212), we get a palindrome (41231213214).

The spelling of 21210112002 in words is "twenty-one billion, two hundred ten million, one hundred twelve thousand, two".