21111211002 has 32 divisors (see below), whose sum is σ = 48796387200. Its totient is φ = 5964000768.

The previous prime is 21111210977. The next prime is 21111211003. The reversal of 21111211002 is 20011211112.

It is not an unprimeable number, because it can be changed into a prime (21111211003) 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 15 ways as a sum of consecutive naturals, for example, 2820127 + ... + 2827602.

It is an arithmetic number, because the mean of its divisors is an integer number (1524887100).

Almost surely, 2^21111211002 is an apocalyptic number.

21111211002 is an abundant number, since it is smaller than the sum of its proper divisors (27685176198).

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

21111211002 is a wasteful number, since it uses less digits than its factorization.

21111211002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5647830.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111211002 its reverse (20011211112), we get a palindrome (41122422114).

The spelling of 21111211002 in words is "twenty-one billion, one hundred eleven million, two hundred eleven thousand, two".