2545243021 has 8 divisors (see below), whose sum is σ = 2679689600. Its totient is φ = 2410845120.

The previous prime is 2545243013. The next prime is 2545243027. The reversal of 2545243021 is 1203425452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2545243021 - 2³ = 2545243013 is a prime.

It is a super-3 number, since 3×2545243021³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545243027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152245 + ... + 168133.

It is an arithmetic number, because the mean of its divisors is an integer number (334961200).

Almost surely, 2^2545243021 is an apocalyptic number.

It is an amenable number.

2545243021 is a deficient number, since it is larger than the sum of its proper divisors (134446579).

2545243021 is a wasteful number, since it uses less digits than its factorization.

2545243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24339.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 2545243021 is about 50450.4015940409. The cubic root of 2545243021 is about 1365.3471404838.

Adding to 2545243021 its reverse (1203425452), we get a palindrome (3748668473).

The spelling of 2545243021 in words is "two billion, five hundred forty-five million, two hundred forty-three thousand, twenty-one".