21755851270 has 16 divisors (see below), whose sum is σ = 39632347440. Its totient is φ = 8597492704.

The previous prime is 21755851253. The next prime is 21755851277. The reversal of 21755851270 is 7215855712.

It is a super-2 number, since 2×21755851270² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21755851277) by changing a digit.

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, 13105105 + ... + 13106764.

It is an arithmetic number, because the mean of its divisors is an integer number (2477021715).

Almost surely, 2^21755851270 is an apocalyptic number.

21755851270 is a deficient number, since it is larger than the sum of its proper divisors (17876496170).

21755851270 is a wasteful number, since it uses less digits than its factorization.

21755851270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26211959.

The product of its (nonzero) digits is 196000, while the sum is 43.

The spelling of 21755851270 in words is "twenty-one billion, seven hundred fifty-five million, eight hundred fifty-one thousand, two hundred seventy".