20405030121 has 12 divisors (see below), whose sum is σ = 33684494272. Its totient is φ = 11660017176.

The previous prime is 20405030111. The next prime is 20405030179. The reversal of 20405030121 is 12103050402.

20405030121 is a `hidden beast` number, since 2 + 0 + 40 + 503 + 0 + 121 = 666.

It is not a de Polignac number, because 20405030121 - 2⁶ = 20405030057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20405030094 and 20405030103.

It is not an unprimeable number, because it can be changed into a prime (20405030111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161944621 + ... + 161944746.

Almost surely, 2^20405030121 is an apocalyptic number.

20405030121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20405030121 is a deficient number, since it is larger than the sum of its proper divisors (13279464151).

20405030121 is a wasteful number, since it uses less digits than its factorization.

20405030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323889380 (or 323889377 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 20405030121 its reverse (12103050402), we get a palindrome (32508080523).

The spelling of 20405030121 in words is "twenty billion, four hundred five million, thirty thousand, one hundred twenty-one".