21311030202 has 64 divisors (see below), whose sum is σ = 53217782784. Its totient is φ = 5527146240.

The previous prime is 21311030183. The next prime is 21311030227. The reversal of 21311030202 is 20203011312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281778 + ... + 349314.

It is an arithmetic number, because the mean of its divisors is an integer number (831527856).

Almost surely, 2^21311030202 is an apocalyptic number.

21311030202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21311030202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26608891392).

21311030202 is an abundant number, since it is smaller than the sum of its proper divisors (31906752582).

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

21311030202 is a wasteful number, since it uses less digits than its factorization.

21311030202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68243.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21311030202 its reverse (20203011312), we get a palindrome (41514041514).

The spelling of 21311030202 in words is "twenty-one billion, three hundred eleven million, thirty thousand, two hundred two".