21945127 has 8 divisors (see below), whose sum is σ = 22906800. Its totient is φ = 21003840.

The previous prime is 21945101. The next prime is 21945137. The reversal of 21945127 is 72154912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21945127 is a prime.

It is a super-2 number, since 2×21945127² = 963177198092258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21945137) 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, 2877 + ... + 7222.

It is an arithmetic number, because the mean of its divisors is an integer number (2863350).

Almost surely, 2^21945127 is an apocalyptic number.

21945127 is a deficient number, since it is larger than the sum of its proper divisors (961673).

21945127 is a wasteful number, since it uses less digits than its factorization.

21945127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10193.

The product of its digits is 5040, while the sum is 31.

The square root of 21945127 is about 4684.5626263292. The cubic root of 21945127 is about 279.9707750110.

The spelling of 21945127 in words is "twenty-one million, nine hundred forty-five thousand, one hundred twenty-seven".