21141223401 has 4 divisors (see below), whose sum is σ = 28188297872. Its totient is φ = 14094148932.

The previous prime is 21141223393. The next prime is 21141223457. The reversal of 21141223401 is 10432214112.

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 not a de Polignac number, because 21141223401 - 2³ = 21141223393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141223501) 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, 3523537231 + ... + 3523537236.

It is an arithmetic number, because the mean of its divisors is an integer number (7047074468).

Almost surely, 2^21141223401 is an apocalyptic number.

It is an amenable number.

21141223401 is a deficient number, since it is larger than the sum of its proper divisors (7047074471).

21141223401 is an equidigital number, since it uses as much as digits as its factorization.

21141223401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047074470.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21141223401 its reverse (10432214112), we get a palindrome (31573437513).

The spelling of 21141223401 in words is "twenty-one billion, one hundred forty-one million, two hundred twenty-three thousand, four hundred one".