21043034012 has 288 divisors, whose sum is σ = 52412946432. Its totient is φ = 7185024000.

The previous prime is 21043034011. The next prime is 21043034017.

21043034012 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21043034012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043034011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 77649437 + ... + 77649707.

Almost surely, 2^21043034012 is an apocalyptic number.

21043034012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21043034012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26206473216).

21043034012 is an abundant number, since it is smaller than the sum of its proper divisors (31369912420).

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

21043034012 is a wasteful number, since it uses less digits than its factorization.

21043034012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

It can be divided in two parts, 210430 and 34012, that added together give a palindrome (244442).

The spelling of 21043034012 in words is "twenty-one billion, forty-three million, thirty-four thousand, twelve".