21900093 has 8 divisors (see below), whose sum is σ = 29246208. Its totient is φ = 14577024.

The previous prime is 21900091. The next prime is 21900107. The reversal of 21900093 is 39000912.

It is a happy number.

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

It is not a de Polignac number, because 21900093 - 2¹ = 21900091 is a prime.

It is a super-2 number, since 2×21900093² = 959228146817298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900091) 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, 3405 + ... + 7442.

It is an arithmetic number, because the mean of its divisors is an integer number (3655776).

Almost surely, 2^21900093 is an apocalyptic number.

It is an amenable number.

21900093 is a deficient number, since it is larger than the sum of its proper divisors (7346115).

21900093 is a wasteful number, since it uses less digits than its factorization.

21900093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11523.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 21900093 is about 4679.7535191503. The cubic root of 21900093 is about 279.7791327960.

The spelling of 21900093 in words is "twenty-one million, nine hundred thousand, ninety-three".