21041401251 has 16 divisors (see below), whose sum is σ = 30263599520. Its totient is φ = 12926995200.

The previous prime is 21041401217. The next prime is 21041401253. The reversal of 21041401251 is 15210414012.

It is not a de Polignac number, because 21041401251 - 2⁷ = 21041401123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041401253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425416 + ... + 472293.

It is an arithmetic number, because the mean of its divisors is an integer number (1891474970).

Almost surely, 2^21041401251 is an apocalyptic number.

21041401251 is a deficient number, since it is larger than the sum of its proper divisors (9222198269).

21041401251 is a wasteful number, since it uses less digits than its factorization.

21041401251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898326.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21041401251 its reverse (15210414012), we get a palindrome (36251815263).

The spelling of 21041401251 in words is "twenty-one billion, forty-one million, four hundred one thousand, two hundred fifty-one".