21751136069 has 8 divisors (see below), whose sum is σ = 23439948000. Its totient is φ = 20064559536.

The previous prime is 21751136021. The next prime is 21751136093. The reversal of 21751136069 is 96063115712.

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

It is a cyclic number.

It is not a de Polignac number, because 21751136069 - 2¹⁶ = 21751070533 is a prime.

It is a super-2 number, since 2×21751136069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751136269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538607 + ... + 577580.

It is an arithmetic number, because the mean of its divisors is an integer number (2929993500).

Almost surely, 2^21751136069 is an apocalyptic number.

It is an amenable number.

21751136069 is a deficient number, since it is larger than the sum of its proper divisors (1688811931).

21751136069 is a wasteful number, since it uses less digits than its factorization.

21751136069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117699.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 21751136069 in words is "twenty-one billion, seven hundred fifty-one million, one hundred thirty-six thousand, sixty-nine".