21500343512629 has 2 divisors, whose sum is σ = 21500343512630. Its totient is φ = 21500343512628.

The previous prime is 21500343512597. The next prime is 21500343512663. The reversal of 21500343512629 is 92621534300512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16963912100529 + 4536431412100 = 4118727^2 + 2129890^2 .

It is a cyclic number.

It is not a de Polignac number, because 21500343512629 - 2⁵ = 21500343512597 is a prime.

It is a super-2 number, since 2×21500343512629² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21500343512029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750171756314 + 10750171756315.

It is an arithmetic number, because the mean of its divisors is an integer number (10750171756315).

Almost surely, 2^{21500343512629} is an apocalyptic number.

It is an amenable number.

21500343512629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21500343512629 is an equidigital number, since it uses as much as digits as its factorization.

21500343512629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 21500343512629 in words is "twenty-one trillion, five hundred billion, three hundred forty-three million, five hundred twelve thousand, six hundred twenty-nine".