21040434400101 has 4 divisors (see below), whose sum is σ = 28053912533472. Its totient is φ = 14026956266732.

The previous prime is 21040434400099. The next prime is 21040434400109. The reversal of 21040434400101 is 10100443404012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21040434400101 - 2¹ = 21040434400099 is a prime.

It is a super-3 number, since 3×21040434400101³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040434400109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506739066681 + ... + 3506739066686.

It is an arithmetic number, because the mean of its divisors is an integer number (7013478133368).

Almost surely, 2^{21040434400101} is an apocalyptic number.

It is an amenable number.

21040434400101 is a deficient number, since it is larger than the sum of its proper divisors (7013478133371).

21040434400101 is an equidigital number, since it uses as much as digits as its factorization.

21040434400101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013478133370.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21040434400101 its reverse (10100443404012), we get a palindrome (31140877804113).

The spelling of 21040434400101 in words is "twenty-one trillion, forty billion, four hundred thirty-four million, four hundred thousand, one hundred one".