21027299 has 8 divisors (see below), whose sum is σ = 21318000. Its totient is φ = 20738592.

The previous prime is 21027287. The next prime is 21027323. The reversal of 21027299 is 99272012.

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

It is a cyclic number.

It is not a de Polignac number, because 21027299 - 2²⁴ = 4250083 is a prime.

It is a super-3 number, since 3×21027299³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21027239) 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, 41057 + ... + 41565.

It is an arithmetic number, because the mean of its divisors is an integer number (2664750).

Almost surely, 2^21027299 is an apocalyptic number.

21027299 is a deficient number, since it is larger than the sum of its proper divisors (290701).

21027299 is a wasteful number, since it uses less digits than its factorization.

21027299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 21027299 is about 4585.5532926791. The cubic root of 21027299 is about 276.0119148746.

The spelling of 21027299 in words is "twenty-one million, twenty-seven thousand, two hundred ninety-nine".