21255243102629 has 2 divisors, whose sum is σ = 21255243102630. Its totient is φ = 21255243102628.

The previous prime is 21255243102559. The next prime is 21255243102647. The reversal of 21255243102629 is 92620134255212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19918386852004 + 1336856250625 = 4463002^2 + 1156225^2 .

It is a cyclic number.

It is not a de Polignac number, because 21255243102629 - 2²⁴ = 21255226325413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21255243102629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21255243102689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627621551314 + 10627621551315.

It is an arithmetic number, because the mean of its divisors is an integer number (10627621551315).

Almost surely, 2^{21255243102629} is an apocalyptic number.

It is an amenable number.

21255243102629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255243102629 is an equidigital number, since it uses as much as digits as its factorization.

21255243102629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 21255243102629 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred forty-three million, one hundred two thousand, six hundred twenty-nine".