21327955 has 8 divisors (see below), whose sum is σ = 27920304. Its totient is φ = 15511200.

The previous prime is 21327953. The next prime is 21327961. The reversal of 21327955 is 55972312.

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

It is not a de Polignac number, because 21327955 - 2¹ = 21327953 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 21327955.

It is not an unprimeable number, because it can be changed into a prime (21327953) 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 7 ways as a sum of consecutive naturals, for example, 193836 + ... + 193945.

It is an arithmetic number, because the mean of its divisors is an integer number (3490038).

Almost surely, 2^21327955 is an apocalyptic number.

21327955 is a deficient number, since it is larger than the sum of its proper divisors (6592349).

21327955 is a wasteful number, since it uses less digits than its factorization.

21327955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387797.

The product of its digits is 18900, while the sum is 34.

The square root of 21327955 is about 4618.2198951544. The cubic root of 21327955 is about 277.3212007310.

The spelling of 21327955 in words is "twenty-one million, three hundred twenty-seven thousand, nine hundred fifty-five".