2521207021 has 2 divisors, whose sum is σ = 2521207022. Its totient is φ = 2521207020.

The previous prime is 2521207001. The next prime is 2521207069. The reversal of 2521207021 is 1207021252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2521144521 + 62500 = 50211^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521207021 - 2²¹ = 2519109869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2521206983 and 2521207001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521207001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260603510 + 1260603511.

It is an arithmetic number, because the mean of its divisors is an integer number (1260603511).

Almost surely, 2^2521207021 is an apocalyptic number.

It is an amenable number.

2521207021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521207021 is an equidigital number, since it uses as much as digits as its factorization.

2521207021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 2521207021 is about 50211.6223697263. The cubic root of 2521207021 is about 1361.0356552328.

Adding to 2521207021 its reverse (1207021252), we get a palindrome (3728228273).

The spelling of 2521207021 in words is "two billion, five hundred twenty-one million, two hundred seven thousand, twenty-one".