21969363 has 16 divisors (see below), whose sum is σ = 31643136. Its totient is φ = 13477920.

The previous prime is 21969331. The next prime is 21969371. The reversal of 21969363 is 36396912.

It is not a de Polignac number, because 21969363 - 2⁵ = 21969331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21969313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16156 + ... + 17462.

It is an arithmetic number, because the mean of its divisors is an integer number (1977696).

Almost surely, 2^21969363 is an apocalyptic number.

21969363 is a deficient number, since it is larger than the sum of its proper divisors (9673773).

21969363 is a wasteful number, since it uses less digits than its factorization.

21969363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754.

The product of its digits is 52488, while the sum is 39.

The square root of 21969363 is about 4687.1487068366. The cubic root of 21969363 is about 280.0738028241.

The spelling of 21969363 in words is "twenty-one million, nine hundred sixty-nine thousand, three hundred sixty-three".