21149056619 has 8 divisors (see below), whose sum is σ = 21304570848. Its totient is φ = 20993806080.

The previous prime is 21149056597. The next prime is 21149056657. The reversal of 21149056619 is 91665094112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21149056619 - 2²⁰ = 21148008043 is a prime.

It is a super-2 number, since 2×21149056619² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21149056619.

It is not an unprimeable number, because it can be changed into a prime (21149056219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96539 + ... + 227195.

It is an arithmetic number, because the mean of its divisors is an integer number (2663071356).

Almost surely, 2^21149056619 is an apocalyptic number.

21149056619 is a deficient number, since it is larger than the sum of its proper divisors (155514229).

21149056619 is a wasteful number, since it uses less digits than its factorization.

21149056619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131845.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 21149056619 in words is "twenty-one billion, one hundred forty-nine million, fifty-six thousand, six hundred nineteen".