2520785021 has 2 divisors, whose sum is σ = 2520785022. Its totient is φ = 2520785020.

The previous prime is 2520785017. The next prime is 2520785051. The reversal of 2520785021 is 1205870252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1703625625 + 817159396 = 41275^2 + 28586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520785021 - 2² = 2520785017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2520785051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260392510 + 1260392511.

It is an arithmetic number, because the mean of its divisors is an integer number (1260392511).

Almost surely, 2^2520785021 is an apocalyptic number.

It is an amenable number.

2520785021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520785021 is an equidigital number, since it uses as much as digits as its factorization.

2520785021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 2520785021 is about 50207.4199795210. The cubic root of 2520785021 is about 1360.9597142132.

The spelling of 2520785021 in words is "two billion, five hundred twenty million, seven hundred eighty-five thousand, twenty-one".