121302131521 has 2 divisors, whose sum is σ = 121302131522. Its totient is φ = 121302131520.

The previous prime is 121302131479. The next prime is 121302131549. The reversal of 121302131521 is 125131203121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104952673296 + 16349458225 = 323964^2 + 127865^2 .

It is an emirp because it is prime and its reverse (125131203121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121302131521 - 2¹³ = 121302123329 is a prime.

It is a super-2 number, since 2×121302131521² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121302131492 and 121302131501.

It is not a weakly prime, because it can be changed into another prime (121302131591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60651065760 + 60651065761.

It is an arithmetic number, because the mean of its divisors is an integer number (60651065761).

Almost surely, 2^121302131521 is an apocalyptic number.

It is an amenable number.

121302131521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121302131521 is an equidigital number, since it uses as much as digits as its factorization.

121302131521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 121302131521 its reverse (125131203121), we get a palindrome (246433334642).

The spelling of 121302131521 in words is "one hundred twenty-one billion, three hundred two million, one hundred thirty-one thousand, five hundred twenty-one".