21111200120110 has 32 divisors (see below), whose sum is σ = 38034810012672. Its totient is φ = 8436783092640.

The previous prime is 21111200120081. The next prime is 21111200120113. The reversal of 21111200120110 is 1102100211112.

It is a happy number.

It is a super-2 number, since 2×21111200120110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111200120113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56913945 + ... + 57283675.

It is an arithmetic number, because the mean of its divisors is an integer number (1188587812896).

Almost surely, 2^{21111200120110} is an apocalyptic number.

21111200120110 is a deficient number, since it is larger than the sum of its proper divisors (16923609892562).

21111200120110 is a wasteful number, since it uses less digits than its factorization.

21111200120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374928.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111200120110 its reverse (1102100211112), we get a palindrome (22213300331222).

The spelling of 21111200120110 in words is "twenty-one trillion, one hundred eleven billion, two hundred million, one hundred twenty thousand, one hundred ten".