21202102669 has 24 divisors (see below), whose sum is σ = 23803934616. Its totient is φ = 18863644800.

The previous prime is 21202102639. The next prime is 21202102723. The reversal of 21202102669 is 96620120212.

It can be written as a sum of positive squares in 4 ways, for example, as 620757225 + 20581345444 = 24915^2 + 143462^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21202102669 is a prime.

It is a super-2 number, since 2×21202102669² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21202102669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202102639) 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, 2695947 + ... + 2703799.

It is an arithmetic number, because the mean of its divisors is an integer number (991830609).

Almost surely, 2^21202102669 is an apocalyptic number.

It is an amenable number.

21202102669 is a deficient number, since it is larger than the sum of its proper divisors (2601831947).

21202102669 is a wasteful number, since it uses less digits than its factorization.

21202102669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8349 (or 8338 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21202102669 in words is "twenty-one billion, two hundred two million, one hundred two thousand, six hundred sixty-nine".