21299030 has 8 divisors (see below), whose sum is σ = 38338272. Its totient is φ = 8519608.

The previous prime is 21299029. The next prime is 21299041. The reversal of 21299030 is 3099212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064942 + ... + 1064961.

It is an arithmetic number, because the mean of its divisors is an integer number (4792284).

Almost surely, 2^21299030 is an apocalyptic number.

21299030 is a deficient number, since it is larger than the sum of its proper divisors (17039242).

21299030 is a wasteful number, since it uses less digits than its factorization.

21299030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129910.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 21299030 is about 4615.0872147772. The cubic root of 21299030 is about 277.1957762239.

It can be divided in two parts, 2 and 1299030, that multiplied together give a triangular number (2598060 = T₂₂₇₉).

The spelling of 21299030 in words is "twenty-one million, two hundred ninety-nine thousand, thirty".