14121657521 has 2 divisors, whose sum is σ = 14121657522. Its totient is φ = 14121657520.

The previous prime is 14121657443. The next prime is 14121657533. The reversal of 14121657521 is 12575612141.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11861605921 + 2260051600 = 108911^2 + 47540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14121657521 is a prime.

It is a super-2 number, since 2×14121657521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (14121657581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7060828760 + 7060828761.

It is an arithmetic number, because the mean of its divisors is an integer number (7060828761).

Almost surely, 2^14121657521 is an apocalyptic number.

It is an amenable number.

14121657521 is a deficient number, since it is larger than the sum of its proper divisors (1).

14121657521 is an equidigital number, since it uses as much as digits as its factorization.

14121657521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 35.

The spelling of 14121657521 in words is "fourteen billion, one hundred twenty-one million, six hundred fifty-seven thousand, five hundred twenty-one".