21054340352 has 36 divisors (see below), whose sum is σ = 42419262816. Its totient is φ = 10428771840.

The previous prime is 21054340337. The next prime is 21054340357. The reversal of 21054340352 is 25304345012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054340357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356924 + ... + 411707.

It is an arithmetic number, because the mean of its divisors is an integer number (1178312856).

Almost surely, 2^21054340352 is an apocalyptic number.

It is an amenable number.

21054340352 is an abundant number, since it is smaller than the sum of its proper divisors (21364922464).

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

21054340352 is an equidigital number, since it uses as much as digits as its factorization.

21054340352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768754 (or 768740 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 21054340352 its reverse (25304345012), we get a palindrome (46358685364).

The spelling of 21054340352 in words is "twenty-one billion, fifty-four million, three hundred forty thousand, three hundred fifty-two".