21434293 has 2 divisors, whose sum is σ = 21434294. Its totient is φ = 21434292.

The previous prime is 21434279. The next prime is 21434323. The reversal of 21434293 is 39243412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20994724 + 439569 = 4582^2 + 663^2 .

It is a cyclic number.

It is not a de Polignac number, because 21434293 - 2¹³ = 21426101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717146 + 10717147.

It is an arithmetic number, because the mean of its divisors is an integer number (10717147).

Almost surely, 2^21434293 is an apocalyptic number.

It is an amenable number.

21434293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434293 is an equidigital number, since it uses as much as digits as its factorization.

21434293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 21434293 is about 4629.7184579626. The cubic root of 21434293 is about 277.7813308997.

The spelling of 21434293 in words is "twenty-one million, four hundred thirty-four thousand, two hundred ninety-three".