21758054900 has 36 divisors (see below), whose sum is σ = 47232125388. Its totient is φ = 8700061440.

The previous prime is 21758054897. The next prime is 21758054921. The reversal of 21758054900 is 945085712.

It can be written as a sum of positive squares in 6 ways, for example, as 1358217316 + 20399837584 = 36854^2 + 142828^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247622 + ... + 323778.

It is an arithmetic number, because the mean of its divisors is an integer number (1312003483).

Almost surely, 2^21758054900 is an apocalyptic number.

21758054900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21758054900 is an abundant number, since it is smaller than the sum of its proper divisors (25474070488).

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

21758054900 is a wasteful number, since it uses less digits than its factorization.

21758054900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79028 (or 79021 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 21758054900 in words is "twenty-one billion, seven hundred fifty-eight million, fifty-four thousand, nine hundred".