10638421 has 2 divisors, whose sum is σ = 10638422. Its totient is φ = 10638420.

The previous prime is 10638391. The next prime is 10638457. The reversal of 10638421 is 12483601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7700625 + 2937796 = 2775^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 10638421 - 2¹³ = 10630229 is a prime.

It is a super-2 number, since 2×10638421² = 226352002746482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10638491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5319210 + 5319211.

It is an arithmetic number, because the mean of its divisors is an integer number (5319211).

Almost surely, 2^10638421 is an apocalyptic number.

It is an amenable number.

10638421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10638421 is an equidigital number, since it uses as much as digits as its factorization.

10638421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 10638421 is about 3261.6592403254. The cubic root of 10638421 is about 219.9340091331.

The spelling of 10638421 in words is "ten million, six hundred thirty-eight thousand, four hundred twenty-one".