21299330 has 16 divisors (see below), whose sum is σ = 41288184. Its totient is φ = 7864320.

The previous prime is 21299329. The next prime is 21299371. The reversal of 21299330 is 3399212.

It can be written as a sum of positive squares in 4 ways, for example, as 19088161 + 2211169 = 4369^2 + 1487^2 .

It is a super-2 number, since 2×21299330² = 907322916897800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21299293 and 21299302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81791 + ... + 82050.

Almost surely, 2^21299330 is an apocalyptic number.

21299330 is a deficient number, since it is larger than the sum of its proper divisors (19988854).

21299330 is a wasteful number, since it uses less digits than its factorization.

21299330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163861.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 21299330 is about 4615.1197167571. The cubic root of 21299330 is about 277.1970776657.

The spelling of 21299330 in words is "twenty-one million, two hundred ninety-nine thousand, three hundred thirty".