121021021 has 4 divisors (see below), whose sum is σ = 132022944. Its totient is φ = 110019100.

The previous prime is 121021007. The next prime is 121021037. The reversal of 121021021 is 120120121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121021021 - 2⁵ = 121020989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020989 and 121021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021091) 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, 5500945 + ... + 5500966.

It is an arithmetic number, because the mean of its divisors is an integer number (33005736).

Almost surely, 2^121021021 is an apocalyptic number.

121021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121021021 is a deficient number, since it is larger than the sum of its proper divisors (11001923).

121021021 is a wasteful number, since it uses less digits than its factorization.

121021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11001922.

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

The square root of 121021021 is about 11000.9554585045. The cubic root of 121021021 is about 494.6373850091.

Adding to 121021021 its reverse (120120121), we get a palindrome (241141142).

The spelling of 121021021 in words is "one hundred twenty-one million, twenty-one thousand, twenty-one".