21202030 has 8 divisors (see below), whose sum is σ = 38163672. Its totient is φ = 8480808.

The previous prime is 21202003. The next prime is 21202033. The reversal of 21202030 is 3020212.

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

It is a super-2 number, since 2×21202030² = 899052152241800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2120203 = 21202030 / (2 + 1 + 2 + 0 + 2 + 0 + 3 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21201998 and 21202016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202033) 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 3 ways as a sum of consecutive naturals, for example, 1060092 + ... + 1060111.

It is an arithmetic number, because the mean of its divisors is an integer number (4770459).

Almost surely, 2^21202030 is an apocalyptic number.

21202030 is a deficient number, since it is larger than the sum of its proper divisors (16961642).

21202030 is a wasteful number, since it uses less digits than its factorization.

21202030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120210.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21202030 is about 4604.5662119249. The cubic root of 21202030 is about 276.7743343143.

Adding to 21202030 its reverse (3020212), we get a palindrome (24222242).

The spelling of 21202030 in words is "twenty-one million, two hundred two thousand, thirty".