121111121100021 has 8 divisors (see below), whose sum is σ = 173903148246240. Its totient is φ = 74529920676912.

The previous prime is 121111121099897. The next prime is 121111121100037. The reversal of 121111121100021 is 120001121111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121111121100021 - 2²⁶ = 121111053991157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111121100721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1552706680731 + ... + 1552706680808.

It is an arithmetic number, because the mean of its divisors is an integer number (21737893530780).

Almost surely, 2^{121111121100021} is an apocalyptic number.

It is an amenable number.

121111121100021 is a deficient number, since it is larger than the sum of its proper divisors (52792027146219).

121111121100021 is a wasteful number, since it uses less digits than its factorization.

121111121100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105413361555.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 121111121100021 its reverse (120001121111121), we get a palindrome (241112242211142).

The spelling of 121111121100021 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred thousand, twenty-one".