21886129 has 8 divisors (see below), whose sum is σ = 22848488. Its totient is φ = 20943360.

The previous prime is 21886127. The next prime is 21886141. The reversal of 21886129 is 92168812.

It can be written as a sum of positive squares in 4 ways, for example, as 245025 + 21641104 = 495^2 + 4652^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21886129 - 2¹ = 21886127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21886127) 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, 2592 + ... + 7105.

It is an arithmetic number, because the mean of its divisors is an integer number (2856061).

Almost surely, 2^21886129 is an apocalyptic number.

It is an amenable number.

21886129 is a deficient number, since it is larger than the sum of its proper divisors (962359).

21886129 is an equidigital number, since it uses as much as digits as its factorization.

21886129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9795.

The product of its digits is 13824, while the sum is 37.

The square root of 21886129 is about 4678.2613223291. The cubic root of 21886129 is about 279.7196556290.

The spelling of 21886129 in words is "twenty-one million, eight hundred eighty-six thousand, one hundred twenty-nine".