21311211202 has 16 divisors (see below), whose sum is σ = 32145196032. Its totient is φ = 10596184480.

The previous prime is 21311211151. The next prime is 21311211217. The reversal of 21311211202 is 20211211312.

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 7 ways as a sum of consecutive naturals, for example, 1364763 + ... + 1380289.

It is an arithmetic number, because the mean of its divisors is an integer number (2009074752).

Almost surely, 2^21311211202 is an apocalyptic number.

21311211202 is a deficient number, since it is larger than the sum of its proper divisors (10833984830).

21311211202 is a wasteful number, since it uses less digits than its factorization.

21311211202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19313.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21311211202 its reverse (20211211312), we get a palindrome (41522422514).

The spelling of 21311211202 in words is "twenty-one billion, three hundred eleven million, two hundred eleven thousand, two hundred two".