21312063054 has 48 divisors (see below), whose sum is σ = 47818948320. Its totient is φ = 6851799360.

The previous prime is 21312063053. The next prime is 21312063061. The reversal of 21312063054 is 45036021312.

21312063054 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 20 + 630 + 5 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312063053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483664 + ... + 525884.

It is an arithmetic number, because the mean of its divisors is an integer number (996228090).

Almost surely, 2^21312063054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21312063054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23909474160).

21312063054 is an abundant number, since it is smaller than the sum of its proper divisors (26506885266).

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

21312063054 is a wasteful number, since it uses less digits than its factorization.

21312063054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43225 (or 43222 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21312063054 its reverse (45036021312), we get a palindrome (66348084366).

The spelling of 21312063054 in words is "twenty-one billion, three hundred twelve million, sixty-three thousand, fifty-four".