21030121203021 has 12 divisors (see below), whose sum is σ = 34716390557472. Its totient is φ = 12017212115976.

The previous prime is 21030121203017. The next prime is 21030121203041. The reversal of 21030121203021 is 12030212103012.

21030121203021 is a `hidden beast` number, since 21 + 0 + 301 + 21 + 20 + 302 + 1 = 666.

It is not a de Polignac number, because 21030121203021 - 2² = 21030121203017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21030121202985 and 21030121203003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030121203041) 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, 166905723771 + ... + 166905723896.

It is an arithmetic number, because the mean of its divisors is an integer number (2893032546456).

Almost surely, 2^{21030121203021} is an apocalyptic number.

21030121203021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21030121203021 is a deficient number, since it is larger than the sum of its proper divisors (13686269354451).

21030121203021 is a wasteful number, since it uses less digits than its factorization.

21030121203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333811447680 (or 333811447677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21030121203021 its reverse (12030212103012), we get a palindrome (33060333306033).

It can be divided in two parts, 2103012 and 1203021, that added together give a palindrome (3306033).

The spelling of 21030121203021 in words is "twenty-one trillion, thirty billion, one hundred twenty-one million, two hundred three thousand, twenty-one".