121111120022221 has 16 divisors (see below), whose sum is σ = 138520064459520. Its totient is φ = 103729017490560.

The previous prime is 121111120022183. The next prime is 121111120022231. The reversal of 121111120022221 is 122220021111121.

It is a happy number.

It is not a de Polignac number, because 121111120022221 - 2³¹ = 121108972538573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111120022231) 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, 740038815 + ... + 740202451.

It is an arithmetic number, because the mean of its divisors is an integer number (8657504028720).

Almost surely, 2^{121111120022221} is an apocalyptic number.

It is an amenable number.

121111120022221 is a deficient number, since it is larger than the sum of its proper divisors (17408944437299).

121111120022221 is a wasteful number, since it uses less digits than its factorization.

121111120022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245004.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121111120022221 its reverse (122220021111121), we get a palindrome (243331141133342).

The spelling of 121111120022221 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred twenty million, twenty-two thousand, two hundred twenty-one".