21629196289 has 4 divisors (see below), whose sum is σ = 21632571220. Its totient is φ = 21625821360.

The previous prime is 21629196287. The next prime is 21629196473. The reversal of 21629196289 is 98269192612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9172850625 + 12456345664 = 95775^2 + 111608^2 .

It is a cyclic number.

It is not a de Polignac number, because 21629196289 - 2¹ = 21629196287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21629196287) 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, 1677834 + ... + 1690675.

It is an arithmetic number, because the mean of its divisors is an integer number (5408142805).

Almost surely, 2^21629196289 is an apocalyptic number.

It is an amenable number.

21629196289 is a deficient number, since it is larger than the sum of its proper divisors (3374931).

21629196289 is an equidigital number, since it uses as much as digits as its factorization.

21629196289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374930.

The product of its digits is 1679616, while the sum is 55.

The spelling of 21629196289 in words is "twenty-one billion, six hundred twenty-nine million, one hundred ninety-six thousand, two hundred eighty-nine".