21311220002 has 16 divisors (see below), whose sum is σ = 33680146560. Its totient is φ = 10085532912.

The previous prime is 21311220001. The next prime is 21311220031. The reversal of 21311220002 is 20002211312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21311220001) by changing a digit.

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, 215018 + ... + 298085.

It is an arithmetic number, because the mean of its divisors is an integer number (2105009160).

Almost surely, 2^21311220002 is an apocalyptic number.

21311220002 is a deficient number, since it is larger than the sum of its proper divisors (12368926558).

21311220002 is a wasteful number, since it uses less digits than its factorization.

21311220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514217.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21311220002 its reverse (20002211312), we get a palindrome (41313431314).

The spelling of 21311220002 in words is "twenty-one billion, three hundred eleven million, two hundred twenty thousand, two".