121021012021 has 8 divisors (see below), whose sum is σ = 148948937984. Its totient is φ = 95752888560.

The previous prime is 121021012019. The next prime is 121021012033. The reversal of 121021012021 is 120210120121.

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

It is not a de Polignac number, because 121021012021 - 2¹ = 121021012019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 121021011992 and 121021012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021012051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664950525 + ... + 664950706.

It is an arithmetic number, because the mean of its divisors is an integer number (18618617248).

Almost surely, 2^121021012021 is an apocalyptic number.

It is an amenable number.

121021012021 is a deficient number, since it is larger than the sum of its proper divisors (27927925963).

121021012021 is a wasteful number, since it uses less digits than its factorization.

121021012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329901251.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121021012021 its reverse (120210120121), we get a palindrome (241231132142).

The spelling of 121021012021 in words is "one hundred twenty-one billion, twenty-one million, twelve thousand, twenty-one".