21203122002 has 16 divisors (see below), whose sum is σ = 43868528640. Its totient is φ = 6823993232.

The previous prime is 21203121967. The next prime is 21203122009. The reversal of 21203122002 is 20022130212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21203122009) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 60928338 + ... + 60928685.

It is an arithmetic number, because the mean of its divisors is an integer number (2741783040).

Almost surely, 2^21203122002 is an apocalyptic number.

21203122002 is an abundant number, since it is smaller than the sum of its proper divisors (22665406638).

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

21203122002 is a wasteful number, since it uses less digits than its factorization.

21203122002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121857057.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21203122002 its reverse (20022130212), we get a palindrome (41225252214).

The spelling of 21203122002 in words is "twenty-one billion, two hundred three million, one hundred twenty-two thousand, two".