21515410554241 has 2 divisors, whose sum is σ = 21515410554242. Its totient is φ = 21515410554240.

The previous prime is 21515410554223. The next prime is 21515410554247. The reversal of 21515410554241 is 14245501451512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18711862169841 + 2803548384400 = 4325721^2 + 1674380^2 .

It is a cyclic number.

It is not a de Polignac number, because 21515410554241 - 2⁹ = 21515410553729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21515410554194 and 21515410554203.

It is not a weakly prime, because it can be changed into another prime (21515410554247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757705277120 + 10757705277121.

It is an arithmetic number, because the mean of its divisors is an integer number (10757705277121).

Almost surely, 2^{21515410554241} is an apocalyptic number.

It is an amenable number.

21515410554241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21515410554241 is an equidigital number, since it uses as much as digits as its factorization.

21515410554241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160000, while the sum is 40.

The spelling of 21515410554241 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, five hundred fifty-four thousand, two hundred forty-one".