21443543101401 has 16 divisors (see below), whose sum is σ = 28625948173440. Its totient is φ = 14278424019840.

The previous prime is 21443543101399. The next prime is 21443543101427. The reversal of 21443543101401 is 10410134534412.

It is not a de Polignac number, because 21443543101401 - 2¹ = 21443543101399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21443543121401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10862181 + ... + 12683613.

It is an arithmetic number, because the mean of its divisors is an integer number (1789121760840).

Almost surely, 2^{21443543101401} is an apocalyptic number.

It is an amenable number.

21443543101401 is a deficient number, since it is larger than the sum of its proper divisors (7182405072039).

21443543101401 is a wasteful number, since it uses less digits than its factorization.

21443543101401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826176.

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 21443543101401 its reverse (10410134534412), we get a palindrome (31853677635813).

The spelling of 21443543101401 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-three million, one hundred one thousand, four hundred one".