21022127 has 16 divisors (see below), whose sum is σ = 24729600. Its totient is φ = 17862264.

The previous prime is 21022117. The next prime is 21022163. The reversal of 21022127 is 72122012.

It is not a de Polignac number, because 21022127 - 2⁶ = 21022063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57098 + ... + 57464.

It is an arithmetic number, because the mean of its divisors is an integer number (1545600).

Almost surely, 2^21022127 is an apocalyptic number.

21022127 is a deficient number, since it is larger than the sum of its proper divisors (3707473).

21022127 is an equidigital number, since it uses as much as digits as its factorization.

21022127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21022127 is about 4584.9893129646. The cubic root of 21022127 is about 275.9892831728.

Adding to 21022127 its reverse (72122012), we get a palindrome (93144139).

The spelling of 21022127 in words is "twenty-one million, twenty-two thousand, one hundred twenty-seven".