21572765122 has 8 divisors (see below), whose sum is σ = 33233719356. Its totient is φ = 10494858672.

The previous prime is 21572765113. The next prime is 21572765209. The reversal of 21572765122 is 22156727512.

It can be written as a sum of positive squares in 2 ways, for example, as 19557742801 + 2015022321 = 139849^2 + 44889^2 .

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

It is a super-3 number, since 3×21572765122³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145761853 + ... + 145762000.

Almost surely, 2^21572765122 is an apocalyptic number.

21572765122 is a deficient number, since it is larger than the sum of its proper divisors (11660954234).

21572765122 is a wasteful number, since it uses less digits than its factorization.

21572765122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291523892.

The product of its digits is 117600, while the sum is 40.

The spelling of 21572765122 in words is "twenty-one billion, five hundred seventy-two million, seven hundred sixty-five thousand, one hundred twenty-two".