21895454 has 12 divisors (see below), whose sum is σ = 38205504. Its totient is φ = 9383724.

The previous prime is 21895451. The next prime is 21895457. The reversal of 21895454 is 45459812.

It is an interprime number because it is at equal distance from previous prime (21895451) and next prime (21895457).

It is a super-2 number, since 2×21895454² = 958821811732232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21895451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111614 + ... + 111809.

It is an arithmetic number, because the mean of its divisors is an integer number (3183792).

Almost surely, 2^21895454 is an apocalyptic number.

21895454 is a deficient number, since it is larger than the sum of its proper divisors (16310050).

21895454 is a wasteful number, since it uses less digits than its factorization.

21895454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223439 (or 223432 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 21895454 is about 4679.2578471377. The cubic root of 21895454 is about 279.7593766082.

The spelling of 21895454 in words is "twenty-one million, eight hundred ninety-five thousand, four hundred fifty-four".