21751704327 has 16 divisors (see below), whose sum is σ = 29760876288. Its totient is φ = 14123746560.

The previous prime is 21751704313. The next prime is 21751704329. The reversal of 21751704327 is 72340715712.

It is not a de Polignac number, because 21751704327 - 2¹⁵ = 21751671559 is a prime.

It is a super-2 number, since 2×21751704327² (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 (21751704329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193299 + ... + 284372.

It is an arithmetic number, because the mean of its divisors is an integer number (1860054768).

Almost surely, 2^21751704327 is an apocalyptic number.

21751704327 is a deficient number, since it is larger than the sum of its proper divisors (8009171961).

21751704327 is a wasteful number, since it uses less digits than its factorization.

21751704327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478070.

The product of its (nonzero) digits is 82320, while the sum is 39.

The spelling of 21751704327 in words is "twenty-one billion, seven hundred fifty-one million, seven hundred four thousand, three hundred twenty-seven".