21463576129 has 2 divisors, whose sum is σ = 21463576130. Its totient is φ = 21463576128.

The previous prime is 21463576067. The next prime is 21463576217. The reversal of 21463576129 is 92167536412.

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., 14432418225 + 7031157904 = 120135^2 + 83852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21463576129 is a prime.

It is not a weakly prime, because it can be changed into another prime (21463576229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10731788064 + 10731788065.

It is an arithmetic number, because the mean of its divisors is an integer number (10731788065).

Almost surely, 2^21463576129 is an apocalyptic number.

It is an amenable number.

21463576129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21463576129 is an equidigital number, since it uses as much as digits as its factorization.

21463576129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The spelling of 21463576129 in words is "twenty-one billion, four hundred sixty-three million, five hundred seventy-six thousand, one hundred twenty-nine".