34729520521 has 4 divisors (see below), whose sum is σ = 34760837700. Its totient is φ = 34698203344.

The previous prime is 34729520513. The next prime is 34729520537. The reversal of 34729520521 is 12502592743.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12502592743 = 19 ⋅658031197.

It can be written as a sum of positive squares in 2 ways, for example, as 1589138496 + 33140382025 = 39864^2 + 182045^2 .

It is a cyclic number.

It is not a de Polignac number, because 34729520521 - 2³ = 34729520513 is a prime.

It is a super-2 number, since 2×34729520521² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (34729520621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15656926 + ... + 15659143.

It is an arithmetic number, because the mean of its divisors is an integer number (8690209425).

Almost surely, 2^34729520521 is an apocalyptic number.

It is an amenable number.

34729520521 is a deficient number, since it is larger than the sum of its proper divisors (31317179).

34729520521 is a wasteful number, since it uses less digits than its factorization.

34729520521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31317178.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 34729520521 in words is "thirty-four billion, seven hundred twenty-nine million, five hundred twenty thousand, five hundred twenty-one".