3121212402 has 48 divisors (see below), whose sum is σ = 8431330752. Its totient is φ = 810704160.

The previous prime is 3121212389. The next prime is 3121212481. The reversal of 3121212402 is 2042121213.

It is a happy number.

3121212402 is a `hidden beast` number, since 31 + 21 + 212 + 402 = 666.

It is a super-3 number, since 3×3121212402³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1124593 + ... + 1127364.

It is an arithmetic number, because the mean of its divisors is an integer number (175652724).

Almost surely, 2^3121212402 is an apocalyptic number.

3121212402 is an abundant number, since it is smaller than the sum of its proper divisors (5310118350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121212402 is a wasteful number, since it uses less digits than its factorization.

3121212402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251983 (or 2251980 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 3121212402 is about 55867.8118597820. The cubic root of 3121212402 is about 1461.4179634440.

Adding to 3121212402 its reverse (2042121213), we get a palindrome (5163333615).

The spelling of 3121212402 in words is "three billion, one hundred twenty-one million, two hundred twelve thousand, four hundred two".