121012021 has 4 divisors (see below), whose sum is σ = 130320652. Its totient is φ = 111703392.

The previous prime is 121012013. The next prime is 121012037. The reversal of 121012021 is 120210121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83631025 + 37380996 = 9145^2 + 6114^2 .

It is a cyclic number.

It is not a de Polignac number, because 121012021 - 2³ = 121012013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121011989 and 121012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4654296 + ... + 4654321.

It is an arithmetic number, because the mean of its divisors is an integer number (32580163).

Almost surely, 2^121012021 is an apocalyptic number.

It is an amenable number.

121012021 is a deficient number, since it is larger than the sum of its proper divisors (9308631).

121012021 is an equidigital number, since it uses as much as digits as its factorization.

121012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9308630.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121012021 is about 11000.5463955205. The cubic root of 121012021 is about 494.6251230985.

Adding to 121012021 its reverse (120210121), we get a palindrome (241222142).

It can be divided in two parts, 1210 and 12021, that added together give a palindrome (13231).

The spelling of 121012021 in words is "one hundred twenty-one million, twelve thousand, twenty-one".