2121005245 has 8 divisors (see below), whose sum is σ = 2679164640. Its totient is φ = 1607498640.

The previous prime is 2121005239. The next prime is 2121005269. The reversal of 2121005245 is 5425001212.

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

It is not a de Polignac number, because 2121005245 - 2⁹ = 2121004733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11163091 + ... + 11163280.

It is an arithmetic number, because the mean of its divisors is an integer number (334895580).

Almost surely, 2^2121005245 is an apocalyptic number.

It is an amenable number.

2121005245 is a deficient number, since it is larger than the sum of its proper divisors (558159395).

2121005245 is a wasteful number, since it uses less digits than its factorization.

2121005245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22326395.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2121005245 is about 46054.3727022744. The cubic root of 2121005245 is about 1284.8346711549.

Adding to 2121005245 its reverse (5425001212), we get a palindrome (7546006457).

The spelling of 2121005245 in words is "two billion, one hundred twenty-one million, five thousand, two hundred forty-five".