21954946 has 8 divisors (see below), whose sum is σ = 35465724. Its totient is φ = 10133040.

The previous prime is 21954941. The next prime is 21954953. The reversal of 21954946 is 64945912.

It can be written as a sum of positive squares in 2 ways, for example, as 21762225 + 192721 = 4665^2 + 439^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21954899 and 21954908.

It is not an unprimeable number, because it can be changed into a prime (21954941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422185 + ... + 422236.

Almost surely, 2^21954946 is an apocalyptic number.

21954946 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21954946 is a deficient number, since it is larger than the sum of its proper divisors (13510778).

21954946 is a wasteful number, since it uses less digits than its factorization.

21954946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844436.

The product of its digits is 77760, while the sum is 40.

The square root of 21954946 is about 4685.6105258547. The cubic root of 21954946 is about 280.0125249499.

The spelling of 21954946 in words is "twenty-one million, nine hundred fifty-four thousand, nine hundred forty-six".