21054000000 has 672 divisors, whose sum is σ = 79487263800. Its totient is φ = 4928000000.

The previous prime is 21053999987. The next prime is 21054000017. The reversal of 21054000000 is 45012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21054000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 725999986 + ... + 726000014.

Almost surely, 2^21054000000 is an apocalyptic number.

21054000000 is a gapful number since it is divisible by the number (20) 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 21054000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39743631900).

21054000000 is an abundant number, since it is smaller than the sum of its proper divisors (58433263800).

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

21054000000 is an frugal number, since it uses more digits than its factorization.

21054000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

Adding to 21054000000 its reverse (45012), we get a palindrome (21054045012).

The spelling of 21054000000 in words is "twenty-one billion, fifty-four million", and thus it is an aban number.