121121020421 has 8 divisors (see below), whose sum is σ = 125198744064. Its totient is φ = 117053958960.

The previous prime is 121121020403. The next prime is 121121020459. The reversal of 121121020421 is 124020121121.

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

It is a de Polignac number, because none of the positive numbers 2^k-121121020421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121121020421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121020481) 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, 2642441 + ... + 2687886.

It is an arithmetic number, because the mean of its divisors is an integer number (15649843008).

Almost surely, 2^121121020421 is an apocalyptic number.

It is an amenable number.

121121020421 is a deficient number, since it is larger than the sum of its proper divisors (4077723643).

121121020421 is an equidigital number, since it uses as much as digits as its factorization.

121121020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5331091.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121121020421 its reverse (124020121121), we get a palindrome (245141141542).

The spelling of 121121020421 in words is "one hundred twenty-one billion, one hundred twenty-one million, twenty thousand, four hundred twenty-one".