21111122111002 has 48 divisors (see below), whose sum is σ = 40043076829056. Its totient is φ = 8170641468000.

The previous prime is 21111122110979. The next prime is 21111122111029. The reversal of 21111122111002 is 20011122111112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41010073 + ... + 41521660.

It is an arithmetic number, because the mean of its divisors is an integer number (834230767272).

Almost surely, 2^{21111122111002} is an apocalyptic number.

21111122111002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111122111002 is a deficient number, since it is larger than the sum of its proper divisors (18931954718054).

21111122111002 is a wasteful number, since it uses less digits than its factorization.

21111122111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82531915 (or 82531904 counting only the distinct ones).

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

Adding to 21111122111002 its reverse (20011122111112), we get a palindrome (41122244222114).

The spelling of 21111122111002 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, one hundred eleven thousand, two".