20193421 has 2 divisors, whose sum is σ = 20193422. Its totient is φ = 20193420.

The previous prime is 20193419. The next prime is 20193451. The reversal of 20193421 is 12439102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 212521 = 4470^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 20193421 - 2¹ = 20193419 is a prime.

Together with 20193419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20193392 and 20193401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20193451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096710 + 10096711.

It is an arithmetic number, because the mean of its divisors is an integer number (10096711).

Almost surely, 2^20193421 is an apocalyptic number.

It is an amenable number.

20193421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20193421 is an equidigital number, since it uses as much as digits as its factorization.

20193421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20193421 is about 4493.7090471013. The cubic root of 20193421 is about 272.3139981422.

The spelling of 20193421 in words is "twenty million, one hundred ninety-three thousand, four hundred twenty-one".