21660363154229 has 2 divisors, whose sum is σ = 21660363154230. Its totient is φ = 21660363154228.

The previous prime is 21660363154153. The next prime is 21660363154237. The reversal of 21660363154229 is 92245136306612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20006592874129 + 1653770280100 = 4472873^2 + 1285990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21660363154229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21660363654229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830181577114 + 10830181577115.

It is an arithmetic number, because the mean of its divisors is an integer number (10830181577115).

Almost surely, 2^{21660363154229} is an apocalyptic number.

It is an amenable number.

21660363154229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21660363154229 is an equidigital number, since it uses as much as digits as its factorization.

21660363154229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 21660363154229 in words is "twenty-one trillion, six hundred sixty billion, three hundred sixty-three million, one hundred fifty-four thousand, two hundred twenty-nine".