21111200120210 has 64 divisors (see below), whose sum is σ = 39486855369600. Its totient is φ = 8121247959552.

The previous prime is 21111200120201. The next prime is 21111200120243. The reversal of 21111200120210 is 1202100211112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9877886 + ... + 11823494.

It is an arithmetic number, because the mean of its divisors is an integer number (616982115150).

Almost surely, 2^{21111200120210} is an apocalyptic number.

21111200120210 is a deficient number, since it is larger than the sum of its proper divisors (18375655249390).

21111200120210 is a wasteful number, since it uses less digits than its factorization.

21111200120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946075.

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

Adding to 21111200120210 its reverse (1202100211112), we get a palindrome (22313300331322).

The spelling of 21111200120210 in words is "twenty-one trillion, one hundred eleven billion, two hundred million, one hundred twenty thousand, two hundred ten".