21356130 has 32 divisors (see below), whose sum is σ = 51741504. Its totient is φ = 5640896.

The previous prime is 21356129. The next prime is 21356143. The reversal of 21356130 is 3165312.

It is a junction number, because it is equal to n+sod(n) for n = 21356097 and 21356106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117 + ... + 6536.

It is an arithmetic number, because the mean of its divisors is an integer number (1616922).

Almost surely, 2^21356130 is an apocalyptic number.

21356130 is an abundant number, since it is smaller than the sum of its proper divisors (30385374).

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

21356130 is a wasteful number, since it uses less digits than its factorization.

21356130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21356130 is about 4621.2693061539. The cubic root of 21356130 is about 277.4432641091.

The spelling of 21356130 in words is "twenty-one million, three hundred fifty-six thousand, one hundred thirty".