21690000075 has 24 divisors (see below), whose sum is σ = 36208976128. Its totient is φ = 11455685280.

The previous prime is 21690000071. The next prime is 21690000083. The reversal of 21690000075 is 57000009612.

It is not a de Polignac number, because 21690000075 - 2² = 21690000071 is a prime.

It is a super-2 number, since 2×21690000075² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21689999997 and 21690000051.

It is not an unprimeable number, because it can be changed into a prime (21690000071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1396159 + ... + 1411608.

Almost surely, 2^21690000075 is an apocalyptic number.

21690000075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21690000075 is a deficient number, since it is larger than the sum of its proper divisors (14518976053).

21690000075 is a wasteful number, since it uses less digits than its factorization.

21690000075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807883 (or 2807878 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

Adding to 21690000075 its reverse (57000009612), we get a palindrome (78690009687).

It can be divided in two parts, 21 and 690000075, that added together give a palindrome (690000096).

The spelling of 21690000075 in words is "twenty-one billion, six hundred ninety million, seventy-five", and thus it is an aban number.