21757354670 has 16 divisors (see below), whose sum is σ = 41224461840. Its totient is φ = 8244892224.

The previous prime is 21757354639. The next prime is 21757354693. The reversal of 21757354670 is 7645375712.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 57256007 + ... + 57256386.

It is an arithmetic number, because the mean of its divisors is an integer number (2576528865).

Almost surely, 2^21757354670 is an apocalyptic number.

21757354670 is a deficient number, since it is larger than the sum of its proper divisors (19467107170).

21757354670 is a wasteful number, since it uses less digits than its factorization.

21757354670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114512419.

The product of its (nonzero) digits is 1234800, while the sum is 47.

The spelling of 21757354670 in words is "twenty-one billion, seven hundred fifty-seven million, three hundred fifty-four thousand, six hundred seventy".