21155354054 has 16 divisors (see below), whose sum is σ = 32513778000. Its totient is φ = 10318076160.

The previous prime is 21155354009. The next prime is 21155354071. The reversal of 21155354054 is 45045355112.

It is a super-3 number, since 3×21155354054³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

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, 96179 + ... + 227070.

It is an arithmetic number, because the mean of its divisors is an integer number (2032111125).

Almost surely, 2^21155354054 is an apocalyptic number.

21155354054 is a deficient number, since it is larger than the sum of its proper divisors (11358423946).

21155354054 is a wasteful number, since it uses less digits than its factorization.

21155354054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324055.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 21155354054 in words is "twenty-one billion, one hundred fifty-five million, three hundred fifty-four thousand, fifty-four".