21040304103021 has 32 divisors (see below), whose sum is σ = 32804357557248. Its totient is φ = 11747506239360.

The previous prime is 21040304102989. The next prime is 21040304103043. The reversal of 21040304103021 is 12030140304012.

It is not a de Polignac number, because 21040304103021 - 2⁵ = 21040304102989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040304103421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63971115 + ... + 64299176.

It is an arithmetic number, because the mean of its divisors is an integer number (1025136173664).

Almost surely, 2^{21040304103021} is an apocalyptic number.

21040304103021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21040304103021 is a deficient number, since it is larger than the sum of its proper divisors (11764053454227).

21040304103021 is a wasteful number, since it uses less digits than its factorization.

21040304103021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128270481.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21040304103021 its reverse (12030140304012), we get a palindrome (33070444407033).

The spelling of 21040304103021 in words is "twenty-one trillion, forty billion, three hundred four million, one hundred three thousand, twenty-one".