521340042111 has 8 divisors (see below), whose sum is σ = 794422921344. Its totient is φ = 297908595480.

The previous prime is 521340042107. The next prime is 521340042163. The reversal of 521340042111 is 111240043125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521340042111 - 2² = 521340042107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521340042611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12412858125 + ... + 12412858166.

It is an arithmetic number, because the mean of its divisors is an integer number (99302865168).

Almost surely, 2^521340042111 is an apocalyptic number.

521340042111 is a deficient number, since it is larger than the sum of its proper divisors (273082879233).

521340042111 is a wasteful number, since it uses less digits than its factorization.

521340042111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24825716301.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 521340042111 its reverse (111240043125), we get a palindrome (632580085236).

The spelling of 521340042111 in words is "five hundred twenty-one billion, three hundred forty million, forty-two thousand, one hundred eleven".