121220210101111 has 48 divisors (see below), whose sum is σ = 145951696999584. Its totient is φ = 100186254080000.

The previous prime is 121220210101103. The next prime is 121220210101139. The reversal of 121220210101111 is 111101012022121.

It is not a de Polignac number, because 121220210101111 - 2³ = 121220210101103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220210101141) 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, 1402536 + ... + 15633538.

It is an arithmetic number, because the mean of its divisors is an integer number (3040660354158).

Almost surely, 2^{121220210101111} is an apocalyptic number.

121220210101111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121220210101111 is a deficient number, since it is larger than the sum of its proper divisors (24731486898473).

121220210101111 is a wasteful number, since it uses less digits than its factorization.

121220210101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14231184 (or 14231173 counting only the distinct ones).

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

Adding to 121220210101111 its reverse (111101012022121), we get a palindrome (232321222123232).

It can be divided in two parts, 12122021010 and 1111, that added together give a palindrome (12122022121).

The spelling of 121220210101111 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred ten million, one hundred one thousand, one hundred eleven".