21054043206 has 64 divisors (see below), whose sum is σ = 53484917760. Its totient is φ = 6013828800.

The previous prime is 21054043201. The next prime is 21054043207. The reversal of 21054043206 is 60234045012.

It is a super-2 number, since 2×21054043206² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21054043206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054043201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2774890 + ... + 2782466.

It is an arithmetic number, because the mean of its divisors is an integer number (835701840).

Almost surely, 2^21054043206 is an apocalyptic number.

21054043206 is an abundant number, since it is smaller than the sum of its proper divisors (32430874554).

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

21054043206 is a wasteful number, since it uses less digits than its factorization.

21054043206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14946 (or 14940 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21054043206 its reverse (60234045012), we get a palindrome (81288088218).

The spelling of 21054043206 in words is "twenty-one billion, fifty-four million, forty-three thousand, two hundred six".