21503514255061 has 2 divisors, whose sum is σ = 21503514255062. Its totient is φ = 21503514255060.

The previous prime is 21503514255011. The next prime is 21503514255133. The reversal of 21503514255061 is 16055241530512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16322359528836 + 5181154726225 = 4040094^2 + 2276215^2 .

It is a cyclic number.

It is not a de Polignac number, because 21503514255061 - 2¹⁵ = 21503514222293 is a prime.

It is a super-2 number, since 2×21503514255061² (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 (21503514255001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751757127530 + 10751757127531.

It is an arithmetic number, because the mean of its divisors is an integer number (10751757127531).

Almost surely, 2^{21503514255061} is an apocalyptic number.

It is an amenable number.

21503514255061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21503514255061 is an equidigital number, since it uses as much as digits as its factorization.

21503514255061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180000, while the sum is 40.

Adding to 21503514255061 its reverse (16055241530512), we get a palindrome (37558755785573).

The spelling of 21503514255061 in words is "twenty-one trillion, five hundred three billion, five hundred fourteen million, two hundred fifty-five thousand, sixty-one".