21698293369 has 4 divisors (see below), whose sum is σ = 21705385060. Its totient is φ = 21691201680.

The previous prime is 21698293367. The next prime is 21698293387. The reversal of 21698293369 is 96339289612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17519963769 + 4178329600 = 132363^2 + 64640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21698293369 - 2¹ = 21698293367 is a prime.

It is a super-2 number, since 2×21698293369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21698293363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3541254 + ... + 3547375.

It is an arithmetic number, because the mean of its divisors is an integer number (5426346265).

Almost surely, 2^21698293369 is an apocalyptic number.

It is an amenable number.

21698293369 is a deficient number, since it is larger than the sum of its proper divisors (7091691).

21698293369 is an equidigital number, since it uses as much as digits as its factorization.

21698293369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091690.

The product of its digits is 7558272, while the sum is 58.

The spelling of 21698293369 in words is "twenty-one billion, six hundred ninety-eight million, two hundred ninety-three thousand, three hundred sixty-nine".