21144445149 has 8 divisors (see below), whose sum is σ = 28294372960. Its totient is φ = 14045407056.

The previous prime is 21144445033. The next prime is 21144445199. The reversal of 21144445149 is 94154444112.

It is a happy number.

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

It is not a de Polignac number, because 21144445149 - 2²⁴ = 21127667933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144445199) 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, 12721459 + ... + 12723120.

It is an arithmetic number, because the mean of its divisors is an integer number (3536796620).

Almost surely, 2^21144445149 is an apocalyptic number.

It is an amenable number.

21144445149 is a deficient number, since it is larger than the sum of its proper divisors (7149927811).

21144445149 is a wasteful number, since it uses less digits than its factorization.

21144445149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25444859.

The product of its digits is 92160, while the sum is 39.

The spelling of 21144445149 in words is "twenty-one billion, one hundred forty-four million, four hundred forty-five thousand, one hundred forty-nine".