21423111212012 has 24 divisors (see below), whose sum is σ = 38783705839200. Its totient is φ = 10342061682176.

The previous prime is 21423111211991. The next prime is 21423111212033. The reversal of 21423111212012 is 21021211132412.

It is an interprime number because it is at equal distance from previous prime (21423111211991) and next prime (21423111212033).

It is a super-2 number, since 2×21423111212012² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8454473 + ... + 10692255.

It is an arithmetic number, because the mean of its divisors is an integer number (1615987743300).

Almost surely, 2^{21423111212012} is an apocalyptic number.

It is an amenable number.

21423111212012 is a deficient number, since it is larger than the sum of its proper divisors (17360594627188).

21423111212012 is a wasteful number, since it uses less digits than its factorization.

21423111212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320345 (or 2320343 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21423111212012 its reverse (21021211132412), we get a palindrome (42444322344424).

The spelling of 21423111212012 in words is "twenty-one trillion, four hundred twenty-three billion, one hundred eleven million, two hundred twelve thousand, twelve".