21976463 has 2 divisors, whose sum is σ = 21976464. Its totient is φ = 21976462.

The previous prime is 21976441. The next prime is 21976481. The reversal of 21976463 is 36467912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21976463 - 2⁶ = 21976399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21976433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10988231 + 10988232.

It is an arithmetic number, because the mean of its divisors is an integer number (10988232).

Almost surely, 2^21976463 is an apocalyptic number.

21976463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21976463 is an equidigital number, since it uses as much as digits as its factorization.

21976463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 21976463 is about 4687.9060357477. The cubic root of 21976463 is about 280.1039707421.

The spelling of 21976463 in words is "twenty-one million, nine hundred seventy-six thousand, four hundred sixty-three".