21445754 has 16 divisors (see below), whose sum is σ = 35350560. Its totient is φ = 9676560.

The previous prime is 21445751. The next prime is 21445757. The reversal of 21445754 is 45754412.

It is an interprime number because it is at equal distance from previous prime (21445751) and next prime (21445757).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21445754.

It is not an unprimeable number, because it can be changed into a prime (21445751) 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, 449 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (2209410).

Almost surely, 2^21445754 is an apocalyptic number.

21445754 is a deficient number, since it is larger than the sum of its proper divisors (13904806).

21445754 is a wasteful number, since it uses less digits than its factorization.

21445754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7165.

The product of its digits is 22400, while the sum is 32.

The square root of 21445754 is about 4630.9560567986. The cubic root of 21445754 is about 277.8308323313.

The spelling of 21445754 in words is "twenty-one million, four hundred forty-five thousand, seven hundred fifty-four".