21423712293 has 6 divisors (see below), whose sum is σ = 30945362214. Its totient is φ = 14282474856.

The previous prime is 21423712241. The next prime is 21423712301. The reversal of 21423712293 is 39221732412.

21423712293 is a `hidden beast` number, since 2 + 1 + 423 + 7 + 1 + 229 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12576052449 + 8847659844 = 112143^2 + 94062^2 .

It is not a de Polignac number, because 21423712293 - 2⁶ = 21423712229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423712693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1190206230 + ... + 1190206247.

It is an arithmetic number, because the mean of its divisors is an integer number (5157560369).

Almost surely, 2^21423712293 is an apocalyptic number.

It is an amenable number.

21423712293 is a deficient number, since it is larger than the sum of its proper divisors (9521649921).

21423712293 is a wasteful number, since it uses less digits than its factorization.

21423712293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380412483 (or 2380412480 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The spelling of 21423712293 in words is "twenty-one billion, four hundred twenty-three million, seven hundred twelve thousand, two hundred ninety-three".