21501754554 has 32 divisors (see below), whose sum is σ = 49154244480. Its totient is φ = 6142436352.

The previous prime is 21501754553. The next prime is 21501754583. The reversal of 21501754554 is 45545710512.

It is not an unprimeable number, because it can be changed into a prime (21501754553) 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 15 ways as a sum of consecutive naturals, for example, 274762 + ... + 344234.

It is an arithmetic number, because the mean of its divisors is an integer number (1536070140).

Almost surely, 2^21501754554 is an apocalyptic number.

21501754554 is an abundant number, since it is smaller than the sum of its proper divisors (27652489926).

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

21501754554 is a wasteful number, since it uses less digits than its factorization.

21501754554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76854.

The product of its (nonzero) digits is 140000, while the sum is 39.

The spelling of 21501754554 in words is "twenty-one billion, five hundred one million, seven hundred fifty-four thousand, five hundred fifty-four".