21353351169 has 4 divisors (see below), whose sum is σ = 28471134896. Its totient is φ = 14235567444.

The previous prime is 21353351113. The next prime is 21353351183. The reversal of 21353351169 is 96115335312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21353351169 - 2¹³ = 21353342977 is a prime.

It is a super-2 number, since 2×21353351169² (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 (21353351189) 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, 3558891859 + ... + 3558891864.

It is an arithmetic number, because the mean of its divisors is an integer number (7117783724).

Almost surely, 2^21353351169 is an apocalyptic number.

It is an amenable number.

21353351169 is a deficient number, since it is larger than the sum of its proper divisors (7117783727).

21353351169 is an equidigital number, since it uses as much as digits as its factorization.

21353351169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7117783726.

The product of its digits is 72900, while the sum is 39.

The spelling of 21353351169 in words is "twenty-one billion, three hundred fifty-three million, three hundred fifty-one thousand, one hundred sixty-nine".