2121015529 has 2 divisors, whose sum is σ = 2121015530. Its totient is φ = 2121015528.

The previous prime is 2121015527. The next prime is 2121015539. The reversal of 2121015529 is 9255101212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1180059904 + 940955625 = 34352^2 + 30675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121015529 - 2¹ = 2121015527 is a prime.

Together with 2121015527, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2121015497 and 2121015506.

It is not a weakly prime, because it can be changed into another prime (2121015527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060507764 + 1060507765.

It is an arithmetic number, because the mean of its divisors is an integer number (1060507765).

Almost surely, 2^2121015529 is an apocalyptic number.

It is an amenable number.

2121015529 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121015529 is an equidigital number, since it uses as much as digits as its factorization.

2121015529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 2121015529 is about 46054.4843527750. The cubic root of 2121015529 is about 1284.8367477203.

The spelling of 2121015529 in words is "two billion, one hundred twenty-one million, fifteen thousand, five hundred twenty-nine".