21362849 has 4 divisors (see below), whose sum is σ = 21470400. Its totient is φ = 21255300.

The previous prime is 21362839. The next prime is 21362851. The reversal of 21362849 is 94826312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21362849 - 2¹⁶ = 21297313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21362839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53477 + ... + 53874.

It is an arithmetic number, because the mean of its divisors is an integer number (5367600).

Almost surely, 2^21362849 is an apocalyptic number.

It is an amenable number.

21362849 is a deficient number, since it is larger than the sum of its proper divisors (107551).

21362849 is a wasteful number, since it uses less digits than its factorization.

21362849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107550.

The product of its digits is 20736, while the sum is 35.

The square root of 21362849 is about 4621.9962137587. The cubic root of 21362849 is about 277.4723571740.

Adding to 21362849 its sum of digits (35), we get a square (21362884 = 4622²).

The spelling of 21362849 in words is "twenty-one million, three hundred sixty-two thousand, eight hundred forty-nine".