21954063 has 8 divisors (see below), whose sum is σ = 30812800. Its totient is φ = 13865688.

The previous prime is 21954059. The next prime is 21954103. The reversal of 21954063 is 36045912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21954063 - 2² = 21954059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21954063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192523 + ... + 192636.

It is an arithmetic number, because the mean of its divisors is an integer number (3851600).

Almost surely, 2^21954063 is an apocalyptic number.

21954063 is a deficient number, since it is larger than the sum of its proper divisors (8858737).

21954063 is a wasteful number, since it uses less digits than its factorization.

21954063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385181.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21954063 is about 4685.5163002598. The cubic root of 21954063 is about 280.0087709837.

Adding to 21954063 its reverse (36045912), we get a palindrome (57999975).

The spelling of 21954063 in words is "twenty-one million, nine hundred fifty-four thousand, sixty-three".