21001444145311 has 8 divisors (see below), whose sum is σ = 24408458087040. Its totient is φ = 17696132112408.

The previous prime is 21001444145291. The next prime is 21001444145389. The reversal of 21001444145311 is 11354144410012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001444145311 - 2⁷ = 21001444145183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001444143311) 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, 25425476761 + ... + 25425477586.

It is an arithmetic number, because the mean of its divisors is an integer number (3051057260880).

Almost surely, 2^{21001444145311} is an apocalyptic number.

21001444145311 is a deficient number, since it is larger than the sum of its proper divisors (3407013941729).

21001444145311 is an equidigital number, since it uses as much as digits as its factorization.

21001444145311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50850954413.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 21001444145311 its reverse (11354144410012), we get a palindrome (32355588555323).

The spelling of 21001444145311 in words is "twenty-one trillion, one billion, four hundred forty-four million, one hundred forty-five thousand, three hundred eleven".