21653300131249 has 2 divisors, whose sum is σ = 21653300131250. Its totient is φ = 21653300131248.

The previous prime is 21653300131231. The next prime is 21653300131259. The reversal of 21653300131249 is 94213100335612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12632287881249 + 9021012250000 = 3554193^2 + 3003500^2 .

It is a cyclic number.

It is not a de Polignac number, because 21653300131249 - 2⁷ = 21653300131121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21653300131259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826650065624 + 10826650065625.

It is an arithmetic number, because the mean of its divisors is an integer number (10826650065625).

Almost surely, 2^{21653300131249} is an apocalyptic number.

It is an amenable number.

21653300131249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21653300131249 is an equidigital number, since it uses as much as digits as its factorization.

21653300131249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 21653300131249 in words is "twenty-one trillion, six hundred fifty-three billion, three hundred million, one hundred thirty-one thousand, two hundred forty-nine".