21660363154153 has 2 divisors, whose sum is σ = 21660363154154. Its totient is φ = 21660363154152.

The previous prime is 21660363154121. The next prime is 21660363154229. The reversal of 21660363154153 is 35145136306612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20937094549849 + 723268604304 = 4575707^2 + 850452^2 .

It is a cyclic number.

It is not a de Polignac number, because 21660363154153 - 2⁵ = 21660363154121 is a prime.

It is a super-2 number, since 2×21660363154153² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21660363154453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830181577076 + 10830181577077.

It is an arithmetic number, because the mean of its divisors is an integer number (10830181577077).

Almost surely, 2^{21660363154153} is an apocalyptic number.

It is an amenable number.

21660363154153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21660363154153 is an equidigital number, since it uses as much as digits as its factorization.

21660363154153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 21660363154153 in words is "twenty-one trillion, six hundred sixty billion, three hundred sixty-three million, one hundred fifty-four thousand, one hundred fifty-three".