21234143212 has 54 divisors (see below), whose sum is σ = 39118309692. Its totient is φ = 10079899200.

The previous prime is 21234143201. The next prime is 21234143219.

21234143212 is nontrivially palindromic in base 10.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21234143219) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 78354637 + ... + 78354907.

Almost surely, 2^21234143212 is an apocalyptic number.

It is an amenable number.

21234143212 is a deficient number, since it is larger than the sum of its proper divisors (17884166480).

21234143212 is an equidigital number, since it uses as much as digits as its factorization.

21234143212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 357 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The spelling of 21234143212 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty-three thousand, two hundred twelve".