21463355149 has 4 divisors (see below), whose sum is σ = 22593005440. Its totient is φ = 20333704860.

The previous prime is 21463355129. The next prime is 21463355161. The reversal of 21463355149 is 94155336412.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21463355149 is a prime.

It is a super-2 number, since 2×21463355149² (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 (21463355129) 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, 564825117 + ... + 564825154.

It is an arithmetic number, because the mean of its divisors is an integer number (5648251360).

Almost surely, 2^21463355149 is an apocalyptic number.

It is an amenable number.

21463355149 is a deficient number, since it is larger than the sum of its proper divisors (1129650291).

21463355149 is a wasteful number, since it uses less digits than its factorization.

21463355149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129650290.

The product of its digits is 388800, while the sum is 43.

The spelling of 21463355149 in words is "twenty-one billion, four hundred sixty-three million, three hundred fifty-five thousand, one hundred forty-nine".