2121285345 has 32 divisors (see below), whose sum is σ = 3422248704. Its totient is φ = 1121990400.

The previous prime is 2121285307. The next prime is 2121285349. The reversal of 2121285345 is 5435821212.

It is not a de Polignac number, because 2121285345 - 2¹² = 2121281249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121285349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1403140 + ... + 1404650.

It is an arithmetic number, because the mean of its divisors is an integer number (106945272).

Almost surely, 2^2121285345 is an apocalyptic number.

It is an amenable number.

2121285345 is a deficient number, since it is larger than the sum of its proper divisors (1300963359).

2121285345 is a wasteful number, since it uses less digits than its factorization.

2121285345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233.

The product of its digits is 19200, while the sum is 33.

The square root of 2121285345 is about 46057.4135726269. The cubic root of 2121285345 is about 1284.8912270972.

The spelling of 2121285345 in words is "two billion, one hundred twenty-one million, two hundred eighty-five thousand, three hundred forty-five".