21247266344799 has 24 divisors (see below), whose sum is σ = 31172336492976. Its totient is φ = 12863446393600.

The previous prime is 21247266344797. The next prime is 21247266344803. The reversal of 21247266344799 is 99744366274212.

It is not a de Polignac number, because 21247266344799 - 2¹ = 21247266344797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21247266344797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30759594 + ... + 31442759.

It is an arithmetic number, because the mean of its divisors is an integer number (1298847353874).

Almost surely, 2^{21247266344799} is an apocalyptic number.

21247266344799 is a deficient number, since it is larger than the sum of its proper divisors (9925070148177).

21247266344799 is a wasteful number, since it uses less digits than its factorization.

21247266344799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62203319 (or 62203308 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 66.

The spelling of 21247266344799 in words is "twenty-one trillion, two hundred forty-seven billion, two hundred sixty-six million, three hundred forty-four thousand, seven hundred ninety-nine".