3121210212121 has 32 divisors (see below), whose sum is σ = 3544603130880. Its totient is φ = 2732724019200.

The previous prime is 3121210212079. The next prime is 3121210212137. The reversal of 3121210212121 is 1212120121213.

It is a cyclic number.

It is not a de Polignac number, because 3121210212121 - 2¹³ = 3121210203929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3121210212151) 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, 3019401 + ... + 3919081.

It is an arithmetic number, because the mean of its divisors is an integer number (110768847840).

Almost surely, 2^{3121210212121} is an apocalyptic number.

3121210212121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3121210212121 is a deficient number, since it is larger than the sum of its proper divisors (423392918759).

3121210212121 is a wasteful number, since it uses less digits than its factorization.

3121210212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899985.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 3121210212121 its reverse (1212120121213), we get a palindrome (4333330333334).

The spelling of 3121210212121 in words is "three trillion, one hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".