21106170469 has 2 divisors, whose sum is σ = 21106170470. Its totient is φ = 21106170468.

The previous prime is 21106170461. The next prime is 21106170529. The reversal of 21106170469 is 96407160112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18239853025 + 2866317444 = 135055^2 + 53538^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106170469 - 2³ = 21106170461 is a prime.

It is a super-2 number, since 2×21106170469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106170461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553085234 + 10553085235.

It is an arithmetic number, because the mean of its divisors is an integer number (10553085235).

Almost surely, 2^21106170469 is an apocalyptic number.

It is an amenable number.

21106170469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106170469 is an equidigital number, since it uses as much as digits as its factorization.

21106170469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 21106170469 in words is "twenty-one billion, one hundred six million, one hundred seventy thousand, four hundred sixty-nine".