21062130 has 32 divisors (see below), whose sum is σ = 50713344. Its totient is φ = 5598336.

The previous prime is 21062101. The next prime is 21062137. The reversal of 21062130 is 3126012.

It is a super-2 number, since 2×21062130² = 887226640273800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21062137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10054 + ... + 11966.

It is an arithmetic number, because the mean of its divisors is an integer number (1584792).

Almost surely, 2^21062130 is an apocalyptic number.

21062130 is an abundant number, since it is smaller than the sum of its proper divisors (29651214).

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

21062130 is a wasteful number, since it uses less digits than its factorization.

21062130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21062130 is about 4589.3496271258. The cubic root of 21062130 is about 276.1642322279.

Adding to 21062130 its reverse (3126012), we get a palindrome (24188142).

The spelling of 21062130 in words is "twenty-one million, sixty-two thousand, one hundred thirty".