121221021220021 has 8 divisors (see below), whose sum is σ = 121949103386880. Its totient is φ = 120492965336688.

The previous prime is 121221021219979. The next prime is 121221021220051. The reversal of 121221021220021 is 120022120122121.

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

It is a cyclic number.

It is not a de Polignac number, because 121221021220021 - 2¹¹ = 121221021217973 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 (121221021220051) 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, 2720260 + ... + 15806386.

It is an arithmetic number, because the mean of its divisors is an integer number (15243637923360).

Almost surely, 2^{121221021220021} is an apocalyptic number.

It is an amenable number.

121221021220021 is a deficient number, since it is larger than the sum of its proper divisors (728082166859).

121221021220021 is a wasteful number, since it uses less digits than its factorization.

121221021220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13141763.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221021220021 its reverse (120022120122121), we get a palindrome (241243141342142).

The spelling of 121221021220021 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty thousand, twenty-one".