21214877169 has 4 divisors (see below), whose sum is σ = 28286502896. Its totient is φ = 14143251444.

The previous prime is 21214877161. The next prime is 21214877213. The reversal of 21214877169 is 96177841212.

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 21214877169 - 2³ = 21214877161 is a prime.

It is a super-2 number, since 2×21214877169² (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 (21214877161) 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, 3535812859 + ... + 3535812864.

It is an arithmetic number, because the mean of its divisors is an integer number (7071625724).

Almost surely, 2^21214877169 is an apocalyptic number.

It is an amenable number.

21214877169 is a deficient number, since it is larger than the sum of its proper divisors (7071625727).

21214877169 is an equidigital number, since it uses as much as digits as its factorization.

21214877169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071625726.

The product of its digits is 338688, while the sum is 48.

The spelling of 21214877169 in words is "twenty-one billion, two hundred fourteen million, eight hundred seventy-seven thousand, one hundred sixty-nine".