19735421 has 2 divisors, whose sum is σ = 19735422. Its totient is φ = 19735420.

The previous prime is 19735411. The next prime is 19735439. The reversal of 19735421 is 12453791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 9424900 = 3211^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 19735421 - 2¹⁰ = 19734397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19735411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9867710 + 9867711.

It is an arithmetic number, because the mean of its divisors is an integer number (9867711).

Almost surely, 2^19735421 is an apocalyptic number.

It is an amenable number.

19735421 is a deficient number, since it is larger than the sum of its proper divisors (1).

19735421 is an equidigital number, since it uses as much as digits as its factorization.

19735421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 19735421 is about 4442.4566401936. The cubic root of 19735421 is about 270.2394811695.

The spelling of 19735421 in words is "nineteen million, seven hundred thirty-five thousand, four hundred twenty-one".