21038783 has 2 divisors, whose sum is σ = 21038784. Its totient is φ = 21038782.

The previous prime is 21038777. The next prime is 21038789. The reversal of 21038783 is 38783012.

It is a balanced prime because it is at equal distance from previous prime (21038777) and next prime (21038789).

It is a cyclic number.

It is not a de Polignac number, because 21038783 - 2¹² = 21034687 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21038789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519391 + 10519392.

It is an arithmetic number, because the mean of its divisors is an integer number (10519392).

Almost surely, 2^21038783 is an apocalyptic number.

21038783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038783 is an equidigital number, since it uses as much as digits as its factorization.

21038783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 21038783 is about 4586.8053152494. The cubic root of 21038783 is about 276.0621534392.

The spelling of 21038783 in words is "twenty-one million, thirty-eight thousand, seven hundred eighty-three".