21149056463 has 4 divisors (see below), whose sum is σ = 21183334320. Its totient is φ = 21114778608.

The previous prime is 21149056457. The next prime is 21149056493. The reversal of 21149056463 is 36465094112.

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

It is a cyclic number.

It is not a de Polignac number, because 21149056463 - 2⁶ = 21149056399 is a prime.

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 21149056463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21149056493) 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, 17138003 + ... + 17139236.

It is an arithmetic number, because the mean of its divisors is an integer number (5295833580).

Almost surely, 2^21149056463 is an apocalyptic number.

21149056463 is a deficient number, since it is larger than the sum of its proper divisors (34277857).

21149056463 is an equidigital number, since it uses as much as digits as its factorization.

21149056463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34277856.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 21149056463 in words is "twenty-one billion, one hundred forty-nine million, fifty-six thousand, four hundred sixty-three".