21276619149 has 4 divisors (see below), whose sum is σ = 28368825536. Its totient is φ = 14184412764.

The previous prime is 21276619141. The next prime is 21276619153. The reversal of 21276619149 is 94191667212.

It is a happy number.

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 21276619149 - 2³ = 21276619141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21276619098 and 21276619107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276619141) 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, 3546103189 + ... + 3546103194.

It is an arithmetic number, because the mean of its divisors is an integer number (7092206384).

Almost surely, 2^21276619149 is an apocalyptic number.

It is an amenable number.

21276619149 is a deficient number, since it is larger than the sum of its proper divisors (7092206387).

21276619149 is an equidigital number, since it uses as much as digits as its factorization.

21276619149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7092206386.

The product of its digits is 326592, while the sum is 48.

The spelling of 21276619149 in words is "twenty-one billion, two hundred seventy-six million, six hundred nineteen thousand, one hundred forty-nine".