20121231419 has 4 divisors (see below), whose sum is σ = 20121548040. Its totient is φ = 20120914800.

The previous prime is 20121231409. The next prime is 20121231437. The reversal of 20121231419 is 91413212102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121231419 is a prime.

It is a super-2 number, since 2×20121231419² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26282 + ... + 202319.

It is an arithmetic number, because the mean of its divisors is an integer number (5030387010).

Almost surely, 2^20121231419 is an apocalyptic number.

20121231419 is a deficient number, since it is larger than the sum of its proper divisors (316621).

20121231419 is an equidigital number, since it uses as much as digits as its factorization.

20121231419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316620.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 20121231419 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, four hundred nineteen".