20121231404 has 24 divisors (see below), whose sum is σ = 36763711488. Its totient is φ = 9617804240.

The previous prime is 20121231371. The next prime is 20121231409. The reversal of 20121231404 is 40413212102.

It is a super-2 number, since 2×20121231404² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20121231409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106229 + ... + 226995.

It is an arithmetic number, because the mean of its divisors is an integer number (1531821312).

Almost surely, 2^20121231404 is an apocalyptic number.

It is an amenable number.

20121231404 is a deficient number, since it is larger than the sum of its proper divisors (16642480084).

20121231404 is a wasteful number, since it uses less digits than its factorization.

20121231404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122605 (or 122603 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20121231404 its reverse (40413212102), we get a palindrome (60534443506).

The spelling of 20121231404 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, four hundred four".