21551424031413 has 6 divisors (see below), whose sum is σ = 31129834712054. Its totient is φ = 14367616020936.

The previous prime is 21551424031399. The next prime is 21551424031469. The reversal of 21551424031413 is 31413042415512.

21551424031413 is a `hidden beast` number, since 2 + 1 + 551 + 42 + 40 + 3 + 14 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21394158645924 + 157265385489 = 4625382^2 + 396567^2 .

It is not a de Polignac number, because 21551424031413 - 2¹² = 21551424027317 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 (21551424231413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1197301335070 + ... + 1197301335087.

Almost surely, 2^{21551424031413} is an apocalyptic number.

It is an amenable number.

21551424031413 is a deficient number, since it is larger than the sum of its proper divisors (9578410680641).

21551424031413 is a wasteful number, since it uses less digits than its factorization.

21551424031413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394602670163 (or 2394602670160 counting only the distinct ones).

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

Adding to 21551424031413 its reverse (31413042415512), we get a palindrome (52964466446925).

The spelling of 21551424031413 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred twenty-four million, thirty-one thousand, four hundred thirteen".