2542005021 has 4 divisors (see below), whose sum is σ = 3389340032. Its totient is φ = 1694670012.

The previous prime is 2542005007. The next prime is 2542005097. The reversal of 2542005021 is 1205002452.

It is a happy number.

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 not a de Polignac number, because 2542005021 - 2⁶ = 2542004957 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 (2542003021) 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, 423667501 + ... + 423667506.

It is an arithmetic number, because the mean of its divisors is an integer number (847335008).

Almost surely, 2^2542005021 is an apocalyptic number.

It is an amenable number.

2542005021 is a deficient number, since it is larger than the sum of its proper divisors (847335011).

2542005021 is an equidigital number, since it uses as much as digits as its factorization.

2542005021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847335010.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 2542005021 is about 50418.3004572744. The cubic root of 2542005021 is about 1364.7679069761.

Adding to 2542005021 its reverse (1205002452), we get a palindrome (3747007473).

The spelling of 2542005021 in words is "two billion, five hundred forty-two million, five thousand, twenty-one".