21299212 has 24 divisors (see below), whose sum is σ = 40803840. Its totient is φ = 9647760.

The previous prime is 21299167. The next prime is 21299221.

21299212 is nontrivially palindromic in base 10.

It is a congruent number.

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, 15489 + ... + 16807.

It is an arithmetic number, because the mean of its divisors is an integer number (1700160).

Almost surely, 2^21299212 is an apocalyptic number.

21299212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21299212 is a deficient number, since it is larger than the sum of its proper divisors (19504628).

21299212 is a wasteful number, since it uses less digits than its factorization.

21299212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701 (or 1699 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 21299212 is about 4615.1069326723. The cubic root of 21299212 is about 277.1965657667.

The spelling of 21299212 in words is "twenty-one million, two hundred ninety-nine thousand, two hundred twelve".