21867130 has 8 divisors (see below), whose sum is σ = 39360852. Its totient is φ = 8746848.

The previous prime is 21867113. The next prime is 21867133. The reversal of 21867130 is 3176812.

It can be written as a sum of positive squares in 2 ways, for example, as 20277009 + 1590121 = 4503^2 + 1261^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21867133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093347 + ... + 1093366.

Almost surely, 2^21867130 is an apocalyptic number.

21867130 is a deficient number, since it is larger than the sum of its proper divisors (17493722).

21867130 is a wasteful number, since it uses less digits than its factorization.

21867130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186720.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21867130 is about 4676.2303193919. The cubic root of 21867130 is about 279.6386921375.

It can be divided in two parts, 2186 and 7130, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 21867130 in words is "twenty-one million, eight hundred sixty-seven thousand, one hundred thirty".