21041415401 has 4 divisors (see below), whose sum is σ = 21042113412. Its totient is φ = 21040717392.

The previous prime is 21041415379. The next prime is 21041415403. The reversal of 21041415401 is 10451414012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10936139776 + 10105275625 = 104576^2 + 100525^2 .

It is a cyclic number.

It is not a de Polignac number, because 21041415401 - 2¹⁸ = 21041153257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041415403) 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, 301646 + ... + 364791.

It is an arithmetic number, because the mean of its divisors is an integer number (5260528353).

Almost surely, 2^21041415401 is an apocalyptic number.

It is an amenable number.

21041415401 is a deficient number, since it is larger than the sum of its proper divisors (698011).

21041415401 is an equidigital number, since it uses as much as digits as its factorization.

21041415401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698010.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21041415401 its reverse (10451414012), we get a palindrome (31492829413).

The spelling of 21041415401 in words is "twenty-one billion, forty-one million, four hundred fifteen thousand, four hundred one".