21028238754 has 16 divisors (see below), whose sum is σ = 42080007360. Its totient is φ = 7005491280.

The previous prime is 21028238743. The next prime is 21028238779. The reversal of 21028238754 is 45783282012.

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, 968782 + ... + 990249.

It is an arithmetic number, because the mean of its divisors is an integer number (2630000460).

Almost surely, 2^21028238754 is an apocalyptic number.

21028238754 is an abundant number, since it is smaller than the sum of its proper divisors (21051768606).

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

21028238754 is a wasteful number, since it uses less digits than its factorization.

21028238754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960825.

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 21028238754 in words is "twenty-one billion, twenty-eight million, two hundred thirty-eight thousand, seven hundred fifty-four".