21515453424341 has 2 divisors, whose sum is σ = 21515453424342. Its totient is φ = 21515453424340.

The previous prime is 21515453424277. The next prime is 21515453424349. The reversal of 21515453424341 is 14342435451512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17585266123441 + 3930187300900 = 4193479^2 + 1982470^2 .

It is a cyclic number.

It is not a de Polignac number, because 21515453424341 - 2⁶ = 21515453424277 is a prime.

It is a super-2 number, since 2×21515453424341² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21515453424292 and 21515453424301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21515453424349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757726712170 + 10757726712171.

It is an arithmetic number, because the mean of its divisors is an integer number (10757726712171).

Almost surely, 2^{21515453424341} is an apocalyptic number.

It is an amenable number.

21515453424341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21515453424341 is an equidigital number, since it uses as much as digits as its factorization.

21515453424341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152000, while the sum is 44.

Adding to 21515453424341 its reverse (14342435451512), we get a palindrome (35857888875853).

The spelling of 21515453424341 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty-three million, four hundred twenty-four thousand, three hundred forty-one".