21103300434021 has 16 divisors (see below), whose sum is σ = 30335437574400. Its totient is φ = 12972391024320.

The previous prime is 21103300434019. The next prime is 21103300434023. The reversal of 21103300434021 is 12043400330112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21103300434019) and next prime (21103300434023).

It is not a de Polignac number, because 21103300434021 - 2¹ = 21103300434019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21103300433982 and 21103300434000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103300434023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296951446 + ... + 297022503.

It is an arithmetic number, because the mean of its divisors is an integer number (1895964848400).

Almost surely, 2^{21103300434021} is an apocalyptic number.

It is an amenable number.

21103300434021 is a deficient number, since it is larger than the sum of its proper divisors (9232137140379).

21103300434021 is a wasteful number, since it uses less digits than its factorization.

21103300434021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593974876.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21103300434021 its reverse (12043400330112), we get a palindrome (33146700764133).

The spelling of 21103300434021 in words is "twenty-one trillion, one hundred three billion, three hundred million, four hundred thirty-four thousand, twenty-one".