21124545329 has 2 divisors, whose sum is σ = 21124545330. Its totient is φ = 21124545328.

The previous prime is 21124545311. The next prime is 21124545347. The reversal of 21124545329 is 92354542112.

It is a balanced prime because it is at equal distance from previous prime (21124545311) and next prime (21124545347).

It can be written as a sum of positive squares in only one way, i.e., 19943935729 + 1180609600 = 141223^2 + 34360^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124545329 - 2²⁴ = 21107768113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21124545292 and 21124545301.

It is not a weakly prime, because it can be changed into another prime (21124547329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562272664 + 10562272665.

It is an arithmetic number, because the mean of its divisors is an integer number (10562272665).

Almost surely, 2^21124545329 is an apocalyptic number.

It is an amenable number.

21124545329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124545329 is an equidigital number, since it uses as much as digits as its factorization.

21124545329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 38.

The spelling of 21124545329 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, three hundred twenty-nine".