21148274563 has 16 divisors (see below), whose sum is σ = 23912088480. Its totient is φ = 18566989056.

The previous prime is 21148274513. The next prime is 21148274579. The reversal of 21148274563 is 36547284112.

It is a cyclic number.

It is not a de Polignac number, because 21148274563 - 2⁹ = 21148274051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21148274513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393370 + ... + 443887.

It is an arithmetic number, because the mean of its divisors is an integer number (1494505530).

Almost surely, 2^21148274563 is an apocalyptic number.

21148274563 is a deficient number, since it is larger than the sum of its proper divisors (2763813917).

21148274563 is a wasteful number, since it uses less digits than its factorization.

21148274563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837366.

The product of its digits is 322560, while the sum is 43.

The spelling of 21148274563 in words is "twenty-one billion, one hundred forty-eight million, two hundred seventy-four thousand, five hundred sixty-three".