21090497574 has 8 divisors (see below), whose sum is σ = 42180995160. Its totient is φ = 7030165856.

The previous prime is 21090497569. The next prime is 21090497609. The reversal of 21090497574 is 47579409012.

It is a sphenic number, since it is the product of 3 distinct primes.

21090497574 is an admirable number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1757541459 + ... + 1757541470.

It is an arithmetic number, because the mean of its divisors is an integer number (5272624395).

Almost surely, 2^21090497574 is an apocalyptic number.

21090497574 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21090497574 is a wasteful number, since it uses less digits than its factorization.

21090497574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3515082934.

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 21090497574 in words is "twenty-one billion, ninety million, four hundred ninety-seven thousand, five hundred seventy-four".