21954763 has 2 divisors, whose sum is σ = 21954764. Its totient is φ = 21954762.

The previous prime is 21954731. The next prime is 21954767. The reversal of 21954763 is 36745912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21954763 - 2⁵ = 21954731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21954767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977381 + 10977382.

It is an arithmetic number, because the mean of its divisors is an integer number (10977382).

Almost surely, 2^21954763 is an apocalyptic number.

21954763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954763 is an equidigital number, since it uses as much as digits as its factorization.

21954763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 21954763 is about 4685.5909979425. The cubic root of 21954763 is about 280.0117469561.

The spelling of 21954763 in words is "twenty-one million, nine hundred fifty-four thousand, seven hundred sixty-three".