121121001020021 has 8 divisors (see below), whose sum is σ = 121246839897120. Its totient is φ = 120995224337808.

The previous prime is 121121001020017. The next prime is 121121001020029. The reversal of 121121001020021 is 120020100121121.

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 121121001020021 - 2² = 121121001020017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121001019978 and 121121001020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121001020029) 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, 11651306 + ... + 19442091.

It is an arithmetic number, because the mean of its divisors is an integer number (15155854987140).

Almost surely, 2^{121121001020021} is an apocalyptic number.

It is an amenable number.

121121001020021 is a deficient number, since it is larger than the sum of its proper divisors (125838877099).

121121001020021 is a wasteful number, since it uses less digits than its factorization.

121121001020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31097443.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121121001020021 its reverse (120020100121121), we get a palindrome (241141101141142).

The spelling of 121121001020021 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one million, twenty thousand, twenty-one".