3121213645 has 32 divisors (see below), whose sum is σ = 4118045184. Its totient is φ = 2252236800.

The previous prime is 3121213637. The next prime is 3121213673. The reversal of 3121213645 is 5463121213.

3121213645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3121213645 - 2³ = 3121213637 is a prime.

It is a super-3 number, since 3×3121213645³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7241580 + ... + 7242010.

It is an arithmetic number, because the mean of its divisors is an integer number (128688912).

Almost surely, 2^3121213645 is an apocalyptic number.

It is an amenable number.

3121213645 is a deficient number, since it is larger than the sum of its proper divisors (996831539).

3121213645 is a wasteful number, since it uses less digits than its factorization.

3121213645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173.

The product of its digits is 4320, while the sum is 28.

The square root of 3121213645 is about 55867.8229842545. The cubic root of 3121213645 is about 1461.4181574437.

Adding to 3121213645 its reverse (5463121213), we get a palindrome (8584334858).

The spelling of 3121213645 in words is "three billion, one hundred twenty-one million, two hundred thirteen thousand, six hundred forty-five".