20030121 has 6 divisors (see below), whose sum is σ = 28932410. Its totient is φ = 13353408.

The previous prime is 20030117. The next prime is 20030137. The reversal of 20030121 is 12103002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 129600 = 4461^2 + 360^2 .

It is not a de Polignac number, because 20030121 - 2² = 20030117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2225569 = 20030121 / (2 + 0 + 0 + 3 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20030191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112776 + ... + 1112793.

Almost surely, 2^20030121 is an apocalyptic number.

It is an amenable number.

20030121 is a deficient number, since it is larger than the sum of its proper divisors (8902289).

20030121 is a wasteful number, since it uses less digits than its factorization.

20030121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225575 (or 2225572 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20030121 is about 4475.5023181761. The cubic root of 20030121 is about 271.5779615961.

Adding to 20030121 its reverse (12103002), we get a palindrome (32133123).

The spelling of 20030121 in words is "twenty million, thirty thousand, one hundred twenty-one".