21455450153513 has 2 divisors, whose sum is σ = 21455450153514. Its totient is φ = 21455450153512.

The previous prime is 21455450153507. The next prime is 21455450153611. The reversal of 21455450153513 is 31535105455412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17837420092969 + 3618030060544 = 4223437^2 + 1902112^2 .

It is a cyclic number.

It is not a de Polignac number, because 21455450153513 - 2¹⁴ = 21455450137129 is a prime.

It is not a weakly prime, because it can be changed into another prime (21455450150513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727725076756 + 10727725076757.

It is an arithmetic number, because the mean of its divisors is an integer number (10727725076757).

Almost surely, 2^{21455450153513} is an apocalyptic number.

It is an amenable number.

21455450153513 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455450153513 is an equidigital number, since it uses as much as digits as its factorization.

21455450153513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 21455450153513 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty million, one hundred fifty-three thousand, five hundred thirteen".