21150134301253 has 2 divisors, whose sum is σ = 21150134301254. Its totient is φ = 21150134301252.

The previous prime is 21150134301239. The next prime is 21150134301301. The reversal of 21150134301253 is 35210343105112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19684635207169 + 1465499094084 = 4436737^2 + 1210578^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150134301253 - 2²⁹ = 21149597430341 is a prime.

It is a super-2 number, since 2×21150134301253² (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 (21150134308253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575067150626 + 10575067150627.

It is an arithmetic number, because the mean of its divisors is an integer number (10575067150627).

Almost surely, 2^{21150134301253} is an apocalyptic number.

It is an amenable number.

21150134301253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150134301253 is an equidigital number, since it uses as much as digits as its factorization.

21150134301253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 21150134301253 its reverse (35210343105112), we get a palindrome (56360477406365).

The spelling of 21150134301253 in words is "twenty-one trillion, one hundred fifty billion, one hundred thirty-four million, three hundred one thousand, two hundred fifty-three".