21471334411381 has 8 divisors (see below), whose sum is σ = 21546270307800. Its totient is φ = 21396409773312.

The previous prime is 21471334411361. The next prime is 21471334411451. The reversal of 21471334411381 is 18311443317412.

It can be written as a sum of positive squares in 4 ways, for example, as 13339660522500 + 8131673888881 = 3652350^2 + 2851609^2 .

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 21471334411381 - 2⁵ = 21471334411349 is a prime.

It is a super-2 number, since 2×21471334411381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471334411321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1015441 + ... + 6631273.

It is an arithmetic number, because the mean of its divisors is an integer number (2693283788475).

Almost surely, 2^{21471334411381} is an apocalyptic number.

It is an amenable number.

21471334411381 is a deficient number, since it is larger than the sum of its proper divisors (74935896419).

21471334411381 is a wasteful number, since it uses less digits than its factorization.

21471334411381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629175.

The product of its digits is 193536, while the sum is 43.

Adding to 21471334411381 its reverse (18311443317412), we get a palindrome (39782777728793).

The spelling of 21471334411381 in words is "twenty-one trillion, four hundred seventy-one billion, three hundred thirty-four million, four hundred eleven thousand, three hundred eighty-one".