21229122869 has 4 divisors (see below), whose sum is σ = 21254918496. Its totient is φ = 21203327244.

The previous prime is 21229122857. The next prime is 21229122881. The reversal of 21229122869 is 96822192212.

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 an interprime number because it is at equal distance from previous prime (21229122857) and next prime (21229122881).

It is a cyclic number.

It is not a de Polignac number, because 21229122869 - 2⁴ = 21229122853 is a prime.

It is a super-2 number, since 2×21229122869² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21229122829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12896579 + ... + 12898224.

It is an arithmetic number, because the mean of its divisors is an integer number (5313729624).

Almost surely, 2^21229122869 is an apocalyptic number.

It is an amenable number.

21229122869 is a deficient number, since it is larger than the sum of its proper divisors (25795627).

21229122869 is an equidigital number, since it uses as much as digits as its factorization.

21229122869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25795626.

The product of its digits is 124416, while the sum is 44.

The spelling of 21229122869 in words is "twenty-one billion, two hundred twenty-nine million, one hundred twenty-two thousand, eight hundred sixty-nine".