121201021 has 4 divisors (see below), whose sum is σ = 121240444. Its totient is φ = 121161600.

The previous prime is 121200997. The next prime is 121201037. The reversal of 121201021 is 120102121.

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 61308900 + 59892121 = 7830^2 + 7739^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201021 - 2¹⁵ = 121168253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200989 and 121201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201051) 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, 14670 + ... + 21391.

It is an arithmetic number, because the mean of its divisors is an integer number (30310111).

Almost surely, 2^121201021 is an apocalyptic number.

It is an amenable number.

121201021 is a deficient number, since it is larger than the sum of its proper divisors (39423).

121201021 is an equidigital number, since it uses as much as digits as its factorization.

121201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39422.

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

The square root of 121201021 is about 11009.1335263044. The cubic root of 121201021 is about 494.8824956608.

Adding to 121201021 its reverse (120102121), we get a palindrome (241303142).

The spelling of 121201021 in words is "one hundred twenty-one million, two hundred one thousand, twenty-one".