21710550 has 24 divisors (see below), whose sum is σ = 53842536. Its totient is φ = 5789440.

The previous prime is 21710537. The next prime is 21710567. The reversal of 21710550 is 5501712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72219 + ... + 72518.

It is an arithmetic number, because the mean of its divisors is an integer number (2243439).

Almost surely, 2^21710550 is an apocalyptic number.

21710550 is an abundant number, since it is smaller than the sum of its proper divisors (32131986).

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

21710550 is a wasteful number, since it uses less digits than its factorization.

21710550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144752 (or 144747 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 21710550 is about 4659.4581230010. The cubic root of 21710550 is about 278.9696399435.

The spelling of 21710550 in words is "twenty-one million, seven hundred ten thousand, five hundred fifty".