121221120021 has 8 divisors (see below), whose sum is σ = 162304429440. Its totient is φ = 80475945312.

The previous prime is 121221120011. The next prime is 121221120029. The reversal of 121221120021 is 120021122121.

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

It is not a de Polignac number, because 121221120021 - 2¹¹ = 121221117973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221120029) 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, 84532840 + ... + 84534273.

It is an arithmetic number, because the mean of its divisors is an integer number (20288053680).

Almost surely, 2^121221120021 is an apocalyptic number.

It is an amenable number.

121221120021 is a deficient number, since it is larger than the sum of its proper divisors (41083309419).

121221120021 is a wasteful number, since it uses less digits than its factorization.

121221120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169067355.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221120021 its reverse (120021122121), we get a palindrome (241242242142).

The spelling of 121221120021 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".