21443551401231 has 32 divisors (see below), whose sum is σ = 34796837995200. Its totient is φ = 12990819502080.

The previous prime is 21443551401149. The next prime is 21443551401277. The reversal of 21443551401231 is 13210415534412.

21443551401231 is a `hidden beast` number, since 2 + 1 + 4 + 43 + 551 + 40 + 1 + 23 + 1 = 666.

It is not a de Polignac number, because 21443551401231 - 2¹⁷ = 21443551270159 is a prime.

It is a super-2 number, since 2×21443551401231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443551401431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 805469050 + ... + 805495671.

It is an arithmetic number, because the mean of its divisors is an integer number (1087401187350).

Almost surely, 2^{21443551401231} is an apocalyptic number.

21443551401231 is a deficient number, since it is larger than the sum of its proper divisors (13353286593969).

21443551401231 is a wasteful number, since it uses less digits than its factorization.

21443551401231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610964776 (or 1610964770 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 21443551401231 its reverse (13210415534412), we get a palindrome (34653966935643).

The spelling of 21443551401231 in words is "twenty-one trillion, four hundred forty-three billion, five hundred fifty-one million, four hundred one thousand, two hundred thirty-one".