121220210111 has 48 divisors (see below), whose sum is σ = 165743591328. Its totient is φ = 87149260800.

The previous prime is 121220210107. The next prime is 121220210123. The reversal of 121220210111 is 111012022121.

It is not a de Polignac number, because 121220210111 - 2² = 121220210107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220210141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26575271 + ... + 26579831.

It is an arithmetic number, because the mean of its divisors is an integer number (3452991486).

Almost surely, 2^121220210111 is an apocalyptic number.

121220210111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121220210111 is a deficient number, since it is larger than the sum of its proper divisors (44523381217).

121220210111 is a wasteful number, since it uses less digits than its factorization.

121220210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8392 (or 8385 counting only the distinct ones).

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

Adding to 121220210111 its reverse (111012022121), we get a palindrome (232232232232).

The spelling of 121220210111 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred eleven".