21369093 has 16 divisors (see below), whose sum is σ = 30224256. Its totient is φ = 13400640.

The previous prime is 21369059. The next prime is 21369109. The reversal of 21369093 is 39096312.

It is not a de Polignac number, because 21369093 - 2¹⁰ = 21368069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369043) 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, 1671 + ... + 6747.

It is an arithmetic number, because the mean of its divisors is an integer number (1889016).

Almost surely, 2^21369093 is an apocalyptic number.

21369093 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21369093 is a deficient number, since it is larger than the sum of its proper divisors (8855163).

21369093 is a wasteful number, since it uses less digits than its factorization.

21369093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5164.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 21369093 is about 4622.6716301291. The cubic root of 21369093 is about 277.4993880353.

The spelling of 21369093 in words is "twenty-one million, three hundred sixty-nine thousand, ninety-three".