21143469312 has 144 divisors (see below), whose sum is σ = 71457258880. Its totient is φ = 6040977408.

The previous prime is 21143469283. The next prime is 21143469317. The reversal of 21143469312 is 21396434112.

21143469312 is a `hidden beast` number, since 21 + 143 + 469 + 31 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143469317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170113 + ... + 266880.

Almost surely, 2^21143469312 is an apocalyptic number.

It is an amenable number.

21143469312 is an abundant number, since it is smaller than the sum of its proper divisors (50313789568).

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

21143469312 is an equidigital number, since it uses as much as digits as its factorization.

21143469312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437025 (or 437005 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The spelling of 21143469312 in words is "twenty-one billion, one hundred forty-three million, four hundred sixty-nine thousand, three hundred twelve".