22740921 has 24 divisors (see below), whose sum is σ = 38001600. Its totient is φ = 12835296.

The previous prime is 22740919. The next prime is 22740923. The reversal of 22740921 is 12904722.

It is an interprime number because it is at equal distance from previous prime (22740919) and next prime (22740923).

It is not a de Polignac number, because 22740921 - 2¹ = 22740919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22740923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3055 + ... + 7403.

It is an arithmetic number, because the mean of its divisors is an integer number (1583400).

Almost surely, 2^22740921 is an apocalyptic number.

22740921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22740921 is a deficient number, since it is larger than the sum of its proper divisors (15260679).

22740921 is a wasteful number, since it uses less digits than its factorization.

22740921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4445 (or 4442 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 22740921 is about 4768.7441743084. The cubic root of 22740921 is about 283.3148572343.

The spelling of 22740921 in words is "twenty-two million, seven hundred forty thousand, nine hundred twenty-one".