21111211002002 has 16 divisors (see below), whose sum is σ = 34547033584800. Its totient is φ = 9595611783840.

The previous prime is 21111211001983. The next prime is 21111211002031. The reversal of 21111211002002 is 20020011211112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19111427 + ... + 20185862.

It is an arithmetic number, because the mean of its divisors is an integer number (2159189599050).

Almost surely, 2^{21111211002002} is an apocalyptic number.

21111211002002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111211002002 is a deficient number, since it is larger than the sum of its proper divisors (13435822582798).

21111211002002 is a wasteful number, since it uses less digits than its factorization.

21111211002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39321721.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111211002002 its reverse (20020011211112), we get a palindrome (41131222213114).

The spelling of 21111211002002 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, two thousand, two".