21111154354304 has 64 divisors (see below), whose sum is σ = 48252600754560. Its totient is φ = 9012432666624.

The previous prime is 21111154354291. The next prime is 21111154354331. The reversal of 21111154354304 is 40345345111112.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 45609332 + ... + 46069875.

It is an arithmetic number, because the mean of its divisors is an integer number (753946886790).

Almost surely, 2^{21111154354304} is an apocalyptic number.

It is an amenable number.

21111154354304 is an abundant number, since it is smaller than the sum of its proper divisors (27141446400256).

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

21111154354304 is an equidigital number, since it uses as much as digits as its factorization.

21111154354304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91679485 (or 91679473 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 21111154354304 its reverse (40345345111112), we get a palindrome (61456499465416).

The spelling of 21111154354304 in words is "twenty-one trillion, one hundred eleven billion, one hundred fifty-four million, three hundred fifty-four thousand, three hundred four".