21650130 has 48 divisors (see below), whose sum is σ = 58743360. Its totient is φ = 5521824.

The previous prime is 21650117. The next prime is 21650131. The reversal of 21650130 is 3105612.

21650130 is a `hidden beast` number, since 2 + 1 + 650 + 13 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21650131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3160 + ... + 7299.

It is an arithmetic number, because the mean of its divisors is an integer number (1223820).

Almost surely, 2^21650130 is an apocalyptic number.

21650130 is an abundant number, since it is smaller than the sum of its proper divisors (37093230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21650130 is a wasteful number, since it uses less digits than its factorization.

21650130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10495 (or 10492 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 21650130 is about 4652.9700192458. The cubic root of 21650130 is about 278.7106106408.

Adding to 21650130 its reverse (3105612), we get a palindrome (24755742).

The spelling of 21650130 in words is "twenty-one million, six hundred fifty thousand, one hundred thirty".