21007463 has 2 divisors, whose sum is σ = 21007464. Its totient is φ = 21007462.

The previous prime is 21007439. The next prime is 21007499. The reversal of 21007463 is 36470012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21007463 - 2¹⁰ = 21006439 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 (21007423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10503731 + 10503732.

It is an arithmetic number, because the mean of its divisors is an integer number (10503732).

Almost surely, 2^21007463 is an apocalyptic number.

21007463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21007463 is an equidigital number, since it uses as much as digits as its factorization.

21007463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21007463 is about 4583.3899026812. The cubic root of 21007463 is about 275.9250960707.

Adding to 21007463 its reverse (36470012), we get a palindrome (57477475).

The spelling of 21007463 in words is "twenty-one million, seven thousand, four hundred sixty-three".