21413444253 has 8 divisors (see below), whose sum is σ = 28813197600. Its totient is φ = 14144660208.

The previous prime is 21413444249. The next prime is 21413444257. The reversal of 21413444253 is 35244431412.

It is an interprime number because it is at equal distance from previous prime (21413444249) and next prime (21413444257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21413444253 - 2² = 21413444249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413444257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32741943 + ... + 32742596.

It is an arithmetic number, because the mean of its divisors is an integer number (3601649700).

Almost surely, 2^21413444253 is an apocalyptic number.

It is an amenable number.

21413444253 is a deficient number, since it is larger than the sum of its proper divisors (7399753347).

21413444253 is a wasteful number, since it uses less digits than its factorization.

21413444253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65484651.

The product of its digits is 46080, while the sum is 33.

Adding to 21413444253 its reverse (35244431412), we get a palindrome (56657875665).

The spelling of 21413444253 in words is "twenty-one billion, four hundred thirteen million, four hundred forty-four thousand, two hundred fifty-three".