21827954 has 8 divisors (see below), whose sum is σ = 32769900. Its totient is φ = 10904656.

The previous prime is 21827951. The next prime is 21827977. The reversal of 21827954 is 45972812.

It can be written as a sum of positive squares in 2 ways, for example, as 19562929 + 2265025 = 4423^2 + 1505^2 .

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

It is a super-2 number, since 2×21827954² = 952919151652232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21827951) 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 in 3 ways as a sum of consecutive naturals, for example, 1229 + ... + 6720.

Almost surely, 2^21827954 is an apocalyptic number.

21827954 is a deficient number, since it is larger than the sum of its proper divisors (10941946).

21827954 is a wasteful number, since it uses less digits than its factorization.

21827954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324.

The product of its digits is 40320, while the sum is 38.

The square root of 21827954 is about 4672.0395974349. The cubic root of 21827954 is about 279.4715969870.

The spelling of 21827954 in words is "twenty-one million, eight hundred twenty-seven thousand, nine hundred fifty-four".