21711020069 has 8 divisors (see below), whose sum is σ = 22126309920. Its totient is φ = 21297307216.

The previous prime is 21711020017. The next prime is 21711020083. The reversal of 21711020069 is 96002011712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21711020069 is a prime.

It is a super-2 number, since 2×21711020069² (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 (21711025069) 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, 366434 + ... + 421539.

It is an arithmetic number, because the mean of its divisors is an integer number (2765788740).

Almost surely, 2^21711020069 is an apocalyptic number.

It is an amenable number.

21711020069 is a deficient number, since it is larger than the sum of its proper divisors (415289851).

21711020069 is an equidigital number, since it uses as much as digits as its factorization.

21711020069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788499.

The product of its (nonzero) digits is 1512, while the sum is 29.

The spelling of 21711020069 in words is "twenty-one billion, seven hundred eleven million, twenty thousand, sixty-nine".