22749321 has 8 divisors (see below), whose sum is σ = 34665664. Its totient is φ = 12999600.

The previous prime is 22749283. The next prime is 22749343. The reversal of 22749321 is 12394722.

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

It is not a de Polignac number, because 22749321 - 2¹⁴ = 22732937 is a prime.

It is a super-2 number, since 2×22749321² = 1035063211922082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22749371) 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, 541630 + ... + 541671.

It is an arithmetic number, because the mean of its divisors is an integer number (4333208).

Almost surely, 2^22749321 is an apocalyptic number.

22749321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22749321 is a deficient number, since it is larger than the sum of its proper divisors (11916343).

22749321 is a wasteful number, since it uses less digits than its factorization.

22749321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083311.

The product of its digits is 6048, while the sum is 30.

The square root of 22749321 is about 4769.6248280132. The cubic root of 22749321 is about 283.3497363822.

The spelling of 22749321 in words is "twenty-two million, seven hundred forty-nine thousand, three hundred twenty-one".