21353500554 has 16 divisors (see below), whose sum is σ = 42722786880. Its totient is φ = 7115202560.

The previous prime is 21353500543. The next prime is 21353500621. The reversal of 21353500554 is 45500535312.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 640119 + ... + 672650.

It is an arithmetic number, because the mean of its divisors is an integer number (2670174180).

Almost surely, 2^21353500554 is an apocalyptic number.

21353500554 is an abundant number, since it is smaller than the sum of its proper divisors (21369286326).

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

21353500554 is a wasteful number, since it uses less digits than its factorization.

21353500554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315485.

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 21353500554 in words is "twenty-one billion, three hundred fifty-three million, five hundred thousand, five hundred fifty-four".