21954463 has 6 divisors (see below), whose sum is σ = 23322176. Its totient is φ = 20662752.

The previous prime is 21954461. The next prime is 21954487. The reversal of 21954463 is 36445912.

It is a happy number.

It is not a de Polignac number, because 21954463 - 2¹ = 21954461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37695 + ... + 38272.

Almost surely, 2^21954463 is an apocalyptic number.

21954463 is a deficient number, since it is larger than the sum of its proper divisors (1367713).

21954463 is an equidigital number, since it uses as much as digits as its factorization.

21954463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76001 (or 75984 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 21954463 is about 4685.5589847957. The cubic root of 21954463 is about 280.0104715472.

The spelling of 21954463 in words is "twenty-one million, nine hundred fifty-four thousand, four hundred sixty-three".