21030302 has 16 divisors (see below), whose sum is σ = 33298560. Its totient is φ = 9933912.

The previous prime is 21030301. The next prime is 21030313. The reversal of 21030302 is 20303012.

It is a super-2 number, since 2×21030302² = 884547204422408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20903 + ... + 21885.

It is an arithmetic number, because the mean of its divisors is an integer number (2081160).

Almost surely, 2^21030302 is an apocalyptic number.

21030302 is a deficient number, since it is larger than the sum of its proper divisors (12268258).

21030302 is a wasteful number, since it uses less digits than its factorization.

21030302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 21030302 is about 4585.8807223913. The cubic root of 21030302 is about 276.0250537363.

Adding to 21030302 its reverse (20303012), we get a palindrome (41333314).

The spelling of 21030302 in words is "twenty-one million, thirty thousand, three hundred two".