121230021 has 24 divisors (see below), whose sum is σ = 178377472. Its totient is φ = 73180800.

The previous prime is 121230017. The next prime is 121230023. The reversal of 121230021 is 120032121.

It is not a de Polignac number, because 121230021 - 2² = 121230017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121229979 and 121230006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121230023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121836 + ... + 122826.

Almost surely, 2^121230021 is an apocalyptic number.

121230021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121230021 is a deficient number, since it is larger than the sum of its proper divisors (57147451).

121230021 is a wasteful number, since it uses less digits than its factorization.

121230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 121230021 is about 11010.4505357410. The cubic root of 121230021 is about 494.9219630067.

Adding to 121230021 its reverse (120032121), we get a palindrome (241262142).

The spelling of 121230021 in words is "one hundred twenty-one million, two hundred thirty thousand, twenty-one".