2530820021 has 4 divisors (see below), whose sum is σ = 2531391552. Its totient is φ = 2530248492.

The previous prime is 2530820003. The next prime is 2530820051. The reversal of 2530820021 is 1200280352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2530820021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2530820051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279071 + ... + 287996.

It is an arithmetic number, because the mean of its divisors is an integer number (632847888).

Almost surely, 2^2530820021 is an apocalyptic number.

It is an amenable number.

2530820021 is a deficient number, since it is larger than the sum of its proper divisors (571531).

2530820021 is an equidigital number, since it uses as much as digits as its factorization.

2530820021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571530.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2530820021 is about 50307.2561466037. The cubic root of 2530820021 is about 1362.7632724819.

The spelling of 2530820021 in words is "two billion, five hundred thirty million, eight hundred twenty thousand, twenty-one".