121011111022221 has 32 divisors (see below), whose sum is σ = 204895312108800. Its totient is φ = 69146244760320.

The previous prime is 121011111022211. The next prime is 121011111022247. The reversal of 121011111022221 is 122220111110121.

It is a happy number.

It is not a de Polignac number, because 121011111022221 - 2⁵ = 121011111022189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121011111022194 and 121011111022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011111022211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9282400 + ... + 18115881.

It is an arithmetic number, because the mean of its divisors is an integer number (6402978503400).

Almost surely, 2^{121011111022221} is an apocalyptic number.

It is an amenable number.

121011111022221 is a deficient number, since it is larger than the sum of its proper divisors (83884201086579).

121011111022221 is a wasteful number, since it uses less digits than its factorization.

121011111022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27421666 (or 27421660 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121011111022221 its reverse (122220111110121), we get a palindrome (243231222132342).

The spelling of 121011111022221 in words is "one hundred twenty-one trillion, eleven billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".