129211297641 has 24 divisors (see below), whose sum is σ = 188410365000. Its totient is φ = 85323601152.

The previous prime is 129211297619. The next prime is 129211297667. The reversal of 129211297641 is 146792112921.

129211297641 is a `hidden beast` number, since 1 + 292 + 11 + 297 + 64 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1264869225 + 127946428416 = 35565^2 + 357696^2 .

It is not a de Polignac number, because 129211297641 - 2²¹ = 129209200489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129211290641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3364375 + ... + 3402563.

It is an arithmetic number, because the mean of its divisors is an integer number (7850431875).

Almost surely, 2^129211297641 is an apocalyptic number.

It is an amenable number.

129211297641 is a deficient number, since it is larger than the sum of its proper divisors (59199067359).

129211297641 is a wasteful number, since it uses less digits than its factorization.

129211297641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41753 (or 41750 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The spelling of 129211297641 in words is "one hundred twenty-nine billion, two hundred eleven million, two hundred ninety-seven thousand, six hundred forty-one".