21340263051 has 16 divisors (see below), whose sum is σ = 31738231200. Its totient is φ = 14171480064.

The previous prime is 21340263037. The next prime is 21340263053. The reversal of 21340263051 is 15036204312.

21340263051 is a `hidden beast` number, since 21 + 3 + 4 + 0 + 2 + 630 + 5 + 1 = 666.

It is not a de Polignac number, because 21340263051 - 2¹¹ = 21340261003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21340263053) 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, 1530766 + ... + 1544643.

It is an arithmetic number, because the mean of its divisors is an integer number (1983639450).

Almost surely, 2^21340263051 is an apocalyptic number.

21340263051 is a deficient number, since it is larger than the sum of its proper divisors (10397968149).

21340263051 is a wasteful number, since it uses less digits than its factorization.

21340263051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075675 (or 3075669 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21340263051 its reverse (15036204312), we get a palindrome (36376467363).

The spelling of 21340263051 in words is "twenty-one billion, three hundred forty million, two hundred sixty-three thousand, fifty-one".